Fragmented Impact Melt

Impact Melt at Necho Crater

Mounds in a Melt Pond

Impact Melt on Klute W Wall

Early Melt on the Greenland Ice Sheet

On June 15, 2016, the Advanced Land Imager (ALI) on NASA’s Earth Observing-1 satellite acquired a natural-color image of an area just inland from the coast of southwestern Greenland (120 kilometers southeast of Ilulisat and 500 kilometers north-northeast of Nuuk). According to Marco Tedesco, a professor at Columbia University’s Lamont Doherty Earth Observatory, melting in this area began relatively early in April but was not sustained. It started up again in May and grew into the watery June scene pictured above. Surface melt can directly contribute to sea level rise via runoff. It can also force its way through crevasses to the base of a glacier, temporarily speeding up ice flow and indirectly contributing to sea level rise. Also, ponding of meltwater can “darken” the ice sheet’s surface and lead to further melting. Read more: <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=88288" rel="nofollow">earthobservatory.nasa.gov/IOTD/view.php?id=88288</a> Credit: NASA Earth Observatory image by Jesse Allen, using EO-1 ALI data provided courtesy of the NASA EO-1 team <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASAGoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

Warming Seas and Melting Ice Sheets

Sea level rise is a natural consequence of the warming of our planet. We know this from basic physics. When water heats up, it expands. So when the ocean warms, sea level rises. When ice is exposed to heat, it melts. And when ice on land melts and water runs into the ocean, sea level rises. For thousands of years, sea level has remained relatively stable and human communities have settled along the planet’s coastlines. But now Earth’s seas are rising. Globally, sea level has risen about eight inches since the beginning of the 20th century and more than two inches in the last 20 years alone. All signs suggest that this rise is accelerating. Read more: <a href="http://go.nasa.gov/1heZn29" rel="nofollow">go.nasa.gov/1heZn29</a> Caption: An iceberg floats in Disko Bay, near Ilulissat, Greenland, on July 24, 2015. The massive Greenland ice sheet is shedding about 300 gigatons of ice a year into the ocean, making it the single largest source of sea level rise from melting ice. Credits: NASA/Saskia Madlener <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASAGoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

Melting Point

Impact crater floors are commonly flat and relatively smooth, the result of the cooling and solidification of impact melt generated by the impact event itself. Often, the pool of impact melt cracks as it cools, a process well illustrated by the striking Abedin crater. Although not visible in the frame above, this crater also hosts cooling cracks on its floor. It also boasts numerous terraces along its inner wall, which likely formed after the impact melt solidified. Note how the fine-grained texture of the inner walls contrasts with the crater's floor. http://photojournal.jpl.nasa.gov/catalog/PIA19231

Rates of Basal Melt of Antarctic Ice Shelves

NASA Science Flights Target Melting Arctic Sea Ice

This summer, with sea ice across the Arctic Ocean shrinking to below-average levels, a NASA airborne survey of polar ice just completed its first flights. Its target: aquamarine pools of melt water on the ice surface that may be accelerating the overall sea ice retreat. NASA’s Operation IceBridge completed the first research flight of its new 2016 Arctic summer campaign on July 13. The science flights, which continue through July 25, are collecting data on sea ice in a year following a record-warm winter in the Arctic. Read more: <a href="http://go.nasa.gov/29T6mxc" rel="nofollow">go.nasa.gov/29T6mxc</a> Caption: A large pool of melt water over sea ice, as seen from an Operation IceBridge flight over the Beaufort Sea on July 14, 2016. During this summer campaign, IceBridge will map the extent, frequency and depth of melt ponds like these to help scientists forecast the Arctic sea ice yearly minimum extent in September. Credit: NASA/Operation IceBridge

Mercury: The Kuiper Melt

Date acquired: April 05, 2013 This striking image of Kuiper shows the crater in a new perspective. This image highlights the crater's smooth impact melt and central peaks. Kuiper, first seen by Mariner 10, is an easily identifiable feature on Mercury's surface due to its bright rays, similar to Hokusai. This image was acquired as a high-resolution targeted observation. Targeted observations are images of a small area on Mercury's surface at resolutions much higher than the 200-meter/pixel morphology base map. It is not possible to cover all of Mercury's surface at this high resolution, but typically several areas of high scientific interest are imaged in this mode each week. The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. During the first two years of orbital operations, MESSENGER acquired over 150,000 images and extensive other data sets. MESSENGER is capable of continuing orbital operations until early 2015. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Maneuvering Melt Ponds

On July 10, 2011, Don Perovich, of Cold Regions Research and Engineering Laboratory, maneuvered through melt ponds collecting optical data along the way to get a sense of the amount of sunlight reflected from sea ice and melt ponds in the Chukchi Sea. The ICESCAPE mission, or "Impacts of Climate on Ecosystems and Chemistry of the Arctic Pacific Environment," is a NASA shipborne investigation to study how changing conditions in the Arctic affect the ocean's chemistry and ecosystems. The bulk of the research took place in the Beaufort and Chukchi seas in summer 2010 and 2011. Credit: NASA/Kathryn Hansen <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASA_GoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

Frozen impact melt flows on the ejecta blanket of the young impact crater Giordano Bruno in this image from NASA Lunar Reconnaissance Orbiter.

Impact Melt Flows on Giordano Bruno

NASA Lunar Reconnaissance Orbiter looks near the northeast edge of the unusually large melt pond adjacent to the lunar far side crater King.

King Crater Unusual Melt Pond

The SeaWinds instrument on NASA Quick Scatterometer QuikScat spacecraft captured these near-real-time backscatter images of melting on the Larsen C ice shelf in Antarctica Weddell Sea between October 27 left and October 29 right.

QuikScat Captures an Early Melt

Sipping From a Melt Pond

On July 19, 2011, Zachary Brown of Stanford University sipped freshwater from a melt pond on sea ice in the Arctic ocean. The ICESCAPE mission, or "Impacts of Climate on Ecosystems and Chemistry of the Arctic Pacific Environment," is a NASA shipborne investigation to study how changing conditions in the Arctic affect the ocean's chemistry and ecosystems. The bulk of the research took place in the Beaufort and Chukchi seas in summer 2010 and 2011. Credit: NASA/Kathryn Hansen <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASA_GoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

Melt Pond Optics

On July 6, 2011, Don Perovich, of Cold Regions Research and Engineering Laboratory, used a spectroradiometer to measure the amount of sunlight reflected from the surface of ice and melt ponds in the Chukchi Sea. The ICESCAPE mission, or "Impacts of Climate on Ecosystems and Chemistry of the Arctic Pacific Environment," is a NASA shipborne investigation to study how changing conditions in the Arctic affect the ocean's chemistry and ecosystems. The bulk of the research took place in the Beaufort and Chukchi seas in summer 2010 and 2011. Credit: NASA/Kathryn Hansen <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASA_GoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

This image shows a region of the sea floor off the coast of northwest Greenland mapped as part of NASA Oceans Melting Greenland OMG mission. The data shown here will be used to understand the pathways by which warm water can reach glacier edges.

NASA OMG Mission Maps Sea Floor Depth off Greenland Coast

Sampling Melt Ponds

On July 10, 2011, Jens Ehn of Scripps Institution of Oceanography (left), and Christie Wood of Clark University (right), scooped water from melt ponds on sea ice in the Chukchi Sea. The water was later analyzed from the Healy's onboard science lab. The ICESCAPE mission, or "Impacts of Climate on Ecosystems and Chemistry of the Arctic Pacific Environment," is a NASA shipborne investigation to study how changing conditions in the Arctic affect the ocean's chemistry and ecosystems. The bulk of the research took place in the Beaufort and Chukchi seas in summer 2010 and 2011. Credit: NASA/Kathryn Hansen <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASA_GoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

These images show the mass Greenland's Jakobshavn Glacier has gained from 2016-17, 2017-18 and 2018-19. Areas with the most growth — about 33 yards (30 meters) — are shown in dark blue. Red areas represent thinning. The images were produced using GLISTIN-A radar data as part of NASA's Ocean's Melting Greenland (OMG) mission. https://photojournal.jpl.nasa.gov/catalog/PIA23147

Jakobshavn Glacier Grows for Third Year in a Row

Glacier Undercutting in Action

In this aerial view, a glacier along Greenland's craggy coastline is actively undergoing undercutting, a process in which meltwater flowing out from the bottom of the glacier enters the fjord. The brown water in front of the glacier is caused by sediment being dredged up from the base of the glacier by meltwater plumes reaching the surface of the fjord. Because the meltwater contains no salt, it is lighter and rises through the saltier ocean water, dragging the warm ocean water into contact with the ice at the glacier's base. The result is increased melting at the bottom of the glacier, which creates and overhanging layer of ice that breaks off (or calves) as icebergs. As the climate warms, the ocean water temperature and the amount of meltwater both increase, combining to hasten this undercutting process and speed up the ice loss from Greenland's Ice Sheet. The image was taken on Aug. 25, 2019 by a probe-dropping airplane as part of the Oceans Melting Greenland (OMG) mission. OMG has been studying glaciers that plunge into Greenland's steep-sided inlets, or fjords, for the past five years, gathering precise measurements of fjord depth and water salinity from probes dropped by plane, supplemented by measurements made by boat. The aim is to better understand how the warming ocean water around Greenland is hastening ice melt and calving of these marine-terminating glaciers. https://photojournal.jpl.nasa.gov/catalog/PIA24162

Apusiaajik Glacier, Greenland

NASA's Oceans Melting Greenland airborne mission found that most of Greenland's glaciers that empty into the ocean are at greater risk of rapid ice loss than previously understood. OMG's six-year field campaign studied the ocean's role in glacial ice loss by gathering precise measurements of ocean depth, temperature, and salinity in front of more than 220 glaciers. The mission's goal was to clarify our understanding of sea level rise over the next 50 years. This photo of Apusiaajik Glacier was taken near Kulusuk, Greenland, on Aug. 26, 2018, during OMG's field operations. https://photojournal.jpl.nasa.gov/catalog/PIA24983

NASA's Observes Effects of Summer Melt on Greenland Ice Sheet

NASA's IceBridge, an airborne survey of polar ice, flew over the Helheim/Kangerdlugssuaq region of Greenland on Sept. 11, 2016. This photograph from the flight captures Greenland's Steenstrup Glacier, with the midmorning sun glinting off of the Denmark Strait in the background. IceBridge completed the final flight of the summer campaign to observe the impact of the summer melt season on the ice sheet on Sept. 16. The IceBridge flights, which began on Aug. 27, are mostly repeats of lines that the team flew in early May, so that scientists can observe changes in ice elevation between the spring and late summer. For this short, end-of-summer campaign, the IceBridge scientists flew aboard an HU-25A Guardian aircraft from NASA's Langley Research Center in Hampton, Virginia. Credit: NASA/John Sonntag <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASAGoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

ADVANCED MANUFACTURING TEAM

NASA's OMG at Thule Air Base, Greenland

NASA's Gulfstream III was one of several research aircraft that NASA's Oceans Melting Greenland mission used during its six-year field campaign to record the temperature, salinity, and depth of the ocean around the entire island. OMG used airports in Greenland, Iceland, and Norway as bases for research flights. This image was taken at Thule Air Base, Greenland, on Sept. 18, 2016. https://photojournal.jpl.nasa.gov/catalog/PIA24984

GALORE Testing - Regolith Melt Testing

Evan Bell, a mechanical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team at NASA’s Kennedy Space Center in Florida, checks the hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Jaime Toro, a mechanical engineer supporting the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project at NASA’s Kennedy Space Center in Florida, checks the hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Elspeth Petersen, left, a chemical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team at NASA’s Kennedy Space Center in Florida, and Evan Bell, GaLORE mechanical engineer, inspect hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – stimulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Elspeth Petersen, a chemical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team at NASA’s Kennedy Space Center in Florida, inspects some of the GaLORE hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Kevin Grossman, left, principal investigator of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project, and Elspeth Petersen, a chemical engineer and member of the GaLORE team, check some of the project’s hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Jaime Toro, a mechanical engineer supporting the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project at NASA’s Kennedy Space Center in Florida, checks the hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Elspeth Petersen, a chemical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team at NASA’s Kennedy Space Center in Florida, inspects hardware before a test to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Members of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team inspect hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory in the Neil Armstrong Operations and Checkout Building at NASA’s Kennedy Space Center in Florida on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Jaime Toro, a mechanical engineer supporting the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project at NASA’s Kennedy Space Center in Florida, checks the hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Elspeth Petersen, left, a chemical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team, and Kevin Grossman, GaLORE principal investigator, inspect a reactor before a test to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

GALORE Testing - Regolith Melt Testing

Elspeth Petersen, a chemical engineer and member of the Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project team at NASA’s Kennedy Space Center in Florida, inspects the GaLORE hardware that will be used to melt lunar regolith – dirt and dust on the Moon made from crushed rock – simulants during a test inside a laboratory at Kennedy’s Neil Armstrong Operations and Checkout Building on Oct. 29, 2020. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate, and the team was tasked with developing a device that could melt lunar regolith and turn it into oxygen. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars.

Dawn Stereo Anaglyph of Impact Melt Deposits at Occator Crater, Ceres

The Dawn spacecraft captured these stereo images of Occator crater on the dwarf planet Ceres in 2018. Framing camera images were used to construct this anaglyph view (which requires red-blue stereo glasses for viewing) of part of the northeastern rim of the crater. This area is approximately 4 miles (7 kilometers) wide and features a thin mantling layer of impact melt draped over faulted terrace blocks. Impact melt flowed through a gap in the blocks in the center of the frame. The spatial resolution of the stereo images is about 11 feet (3.5 meters) per pixel. Occator Crater, named after the Roman god of the agricultural practice of harrowing, is about 57 miles (92 kilometers) in diameter. The conclusion of Dawn's mission operations was Oct. 31, 2018, when the spacecraft depleted its hydrazine used for attitude control. This image was produced by Dr. Paul Schenk at the Lunar and Planetary Institute in Houston. https://photojournal.jpl.nasa.gov/catalog/PIA24064

Beaufort Sea surface temperatures where Canada Mackenzie River discharges into the Arctic Ocean, measured by NASA MODIS instrument; warm river waters had broken through a shoreline sea ice barrier to enhance sea ice melt.

Warm Rivers Play Role in Arctic Sea Ice Melt

This frame from a NASA MODIS animation depicts warming sea surface temperatures in the Arctic Beaufort Sea after warm waters from Canada Mackenzie River broke through a shoreline sea ice barrier in summer 2012, enhancing the melting of sea ice.

Warm Rivers Play Role in Arctic Sea Ice Melt Animation

NASA-funded study says glacier shape matters and influences vulnerability to melting

A new NASA-funded study has identified which glaciers in West Greenland are most susceptible to thinning in the coming decades by analyzing how they’re shaped. The research could help predict how much the Greenland Ice Sheet will contribute to future sea level rise in the next century, a number that currently ranges from inches to feet. “There are glaciers that popped up in our study that flew under the radar until now,” said lead author Denis Felikson, a graduate research assistant at The University of Texas Institute for Geophysics (UTIG) and a Ph.D. student in The University of Texas Department of Aerospace Engineering and Engineering Mechanics. Felikson’s study was published in Nature Geoscience on April 17. Read more: <a href="https://go.nasa.gov/2pJJwNA" rel="nofollow">go.nasa.gov/2pJJwNA</a> Caption: Terminus of Kangerlugssuup Sermerssua glacier in west Greenland Photo credit: Denis Felikson, Univ. of Texas <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASAGoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>

Almost all of Greenland continued to lose mass in May 2019 as the ice sheet continues to melt. https://photojournal.jpl.nasa.gov/catalog/PIA23340

Changes in Mass, Greenland

Necho Crater

This doublet crater looks like a melting snowman tipped on his side.Warmth is in the air, as the southern hemisphere of Mars enters spring

THEMIS ART #80

Well-Preserved Impact Ejecta and Impact Melt-Rich Deposits in Terra Sabaea

This image of a well-preserved unnamed elliptical crater in Terra Sabaea, is illustrative of the complexity of ejecta deposits forming as a by-product of the impact process that shapes much of the surface of Mars. Here we see a portion of the western ejecta deposits emanating from a 10-kilometer impact crater that occurs within the wall of a larger, 60-kilometer-wide crater. In the central part is a lobe-shaped portion of the ejecta blanket from the smaller crater. The crater is elliptical not because of an angled (oblique) impact, but because it occurred on the steep slopes of the wall of a larger crater. This caused it to be truncated along the slope and elongated perpendicular to the slope. As a result, any impact melt from the smaller crater would have preferentially deposited down slope and towards the floor of the larger crater (towards the west). Within this deposit, we can see fine-scale morphological features in the form of a dense network of small ridges and pits. These crater-related pitted materials are consistent with volatile-rich impact melt-bearing deposits seen in some of the best-preserved craters on Mars (e.g., Zumba, Zunil, etc.). These deposits formed immediately after the impact event, and their discernible presence relate to the preservation state of the crater. This image is an attempt to visualize the complex formation and emplacement history of these enigmatic deposits formed by this elliptical crater and to understand its degradation history. http://photojournal.jpl.nasa.gov/catalog/PIA13078

Flow on the Rim of Tooting Crater

This oblique view from NASA's Mars Reconnaissance Orbiter shows a small part of the near-rim ejecta from Tooting Crater. The flow extending from upper left to lower right looks much like a typical lava flow, but doesn't emanate from a volcanic vent. Instead, this must be either melted rock from the impact event, or a wet debris flow from melting of ice. The surface is dusty so color variations are minor. https://photojournal.jpl.nasa.gov/catalog/PIA21648

The frequent coverage provided by NASA SeaWinds instrument on the QuikScat satellite in 1999 provided unprecedented capability to monitor daily and seasonal changes in the key melt zones of Greenland.

Possible Opaline Silica in the Central Uplift of Elorza Crater

This simulation depicts a lake partially filling Mars Gale Crater, receiving runoff from snow melting on the crater rim, showing evidence that NASA Curiosity rover has found ancient streams, deltas and lakes.

Simulated View of Gale Crater Lake on Mars

This is a view from NASA Lunar Reconnaissance Orbiter of a very young impact crater in Balmer basin. The dark streamers are impact melt splashes thrown out during the crater formation.

Recent Impact

The Floor of Saha E

Fraser, Colorado

This photo, taken onboard the Chilean Navy P3 aircraft, shows the ice front of Venable Ice Shelf, West Antarctica, in October 2008. It is an example of a small-size ice shelf that is a large melt water producer.

Ice Front at Venable Ice Shelf

A subset of NAC Image M112162602L showing landslides bottom covering impact melt on the floor top of a fresh Copernican-age crater at the edge of Oceanus Procellarum and west of Balboa crater taken by NASA Lunar Reconnaissance Orbiter.

Fresh Copernican Crater

Situated high in Mercury southern hemisphere, NASA MESSENGER sees Han Kan, a 50-km-diameter impact crater with a well preserved central peak and a smooth floor that is likely solidified impact melt.

The Horses of Han Kan

Warming water and melting land ice have raised global mean sea level 4.5 centimeters 1.7 inches from 1993 to 2008. But the rise is by no means uniform.

Portrait of a Warming Ocean and Rising Sea Levels: Trend of Sea Level Change 1993-2008

This image from NASA Mars Reconnaissance Orbiter shows frosted gullies on a south-facing slope within a crater. At this time of year only south-facing slopes retain the frost, while the north-facing slopes have melted.

Frosty Slopes in Late Spring

Awesome Abedin

This mosaic of oblique images from NASA MESSENGER spacecraft highlights the spectacular interior of Abedin crater. The crater floor is covered with once-molten rock melted by the impact event that formed Abedin. Cracks that formed as this melt cooled are visible. Particularly intriguing is the shallow depression that lies amidst the central peaks of the crater and may be volcanic in origin. Color imaging shows that this depression is surrounded by reddish material, as seen at other sites of explosive volcanism across Mercury. Instrument: Mercury Dual Imaging System (MDIS) Center Latitude: 61.7° Center Longitude: 349.3° E Scale: Abedin crater is 116 km (72 miles) in diameter http://photojournal.jpl.nasa.gov/catalog/PIA19423

K-10 Black crossing snow melt on Devon Island, Canada. photo credit NASA/Lorenzo Fluckiger.

ARC-2007-ACD09-0255-002

ADVANCED MANUFACTURING TEAM

Gullies

Dibble Ice Shelf

This image from NASA Mars Reconnaissance Orbiter shows the southern latitude Hale Crater, a rather large, pristine elliptical crater possessing sharp features, impact melt bodies ponded throughout the structure and few overprinting impact craters.

Light-Toned Gully Materials on Hale Crater Wall

iss065e084906

iss065e084906 (June 1, 2021) --- Expedition 65 Flight Engineer Thomas Pesquet of ESA (European Space Agency) swaps samples inside the Microgravity Sciences Glovebox for an experiment called Solidification Using a Baffle in Sealed Ampoules, or SUBSA. The physics investigation explores experimental methods of crystallizing melts in microgravity and is expected to result in reduced fluid motion in the melt, leading to better distribution of subcomponents and the potential for improved technology used in producing semiconductor crystals.

SUBSA

iss065e061407 (May 24, 2021) --- NASA astronaut and Expedition 65 Flight Engineer Megan McArthur works in the Microgravity Science Glovebox swapping samples for an experiment called Solidification Using a Baffle in Sealed Ampoules, or SUBSA. The physics investigation explores experimental methods of crystallizing melts in microgravity and is expected to result in reduced fluid motion in the melt, leading to better distribution of subcomponents and the potential for improved technology used in producing semiconductor crystals.

iss065e050120

iss065e050120 (May 21, 2021) --- NASA astronaut and Expedition 65 Flight Engineer Shane Kimbrough swaps samples inside the Microgravity Science Glovebox for an experiment called Solidification Using a Baffle in Sealed Ampoules, or SUBSA. The physics investigation explores experimental methods of crystallizing melts in microgravity and is expected to result in reduced fluid motion in the melt, leading to better distribution of subcomponents and the potential for improved technology used in producing semiconductor crystals.

iss064e016385

iss064e016385 (Dec. 29, 2020) --- NASA astronaut and Expedition 64 Flight Engineer Shannon Walker sets up hardware inside the Microgravity Science Glovebox for the Solidification Using a Baffle in Sealed Ampoules (SUBSA) experiment. SUBSA crystallizes melts in microgravity to learn more about the process of semiconductor crystal growth to benefit Earth and space industries. Results may lead to reduced fluid motion in the melt, leading to better distribution of subcomponents and the potential for improved technology used in producing semiconductor crystals.

SUBSA

iss065e020580 (May 5, 2021) --- NASA astronaut and Expedition 65 Flight Engineer Shane Kimbrough is pictured in front of the Microgravity Science Glovebox setting up hardware for a physics investigation. The experiment known as Solidification Using a Baffle in Sealed Ampoules, or SUBSA, explores experimental methods of crystallizing melts in microgravity and is expected to result in reduced fluid motion in the melt, leading to better distribution of subcomponents and the potential for improved technology used in producing semiconductor crystals.

This video clip shows a 3D printing technique where a printer head scans over each layer of a part, blowing metal powder that is melted by a laser. It's one of several ways parts are 3D printed at NASA's Jet Propulsion Laboratory, but was not used to create the parts aboard the Perseverance rover. Movie available at https://photojournal.jpl.nasa.gov/catalog/PIA23972

Video of 3D printing at JPL

Antarctic Ice Shelf Loss Comes From Underneath

Calving front of an ice shelf in West Antarctica. The traditional view on ice shelves, the floating extensions of seaward glaciers, has been that they mostly lose ice by shedding icebergs. A new study by NASA and university researchers has found that warm ocean waters melting the ice sheets from underneath account for 55 percent of all ice shelf mass loss in Antarctica. This image was taken during the 2012 Antarctic campaign of NASA's Operation IceBridge, a mission that provided data for the new ice shelf study. Read more: <a href="http://www.nasa.gov/topics/earth/features/earth20130613.html" rel="nofollow">www.nasa.gov/topics/earth/features/earth20130613.html</a> Credit: NASA/GSFC/Jefferson Beck <a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a> <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="http://twitter.com/NASA_GoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagram.com/nasagoddard?vm=grid" rel="nofollow">Instagram</a>

This image taken NASA Lunar Reconnaissance Orbiter is a high-resolution view of part of the floor of Riccioli Crater. The view is centered on the boundary between a spur of the crater central peak materials and volcanic lava flow deposits.

Riccioli Crater: Cracked, Melted, and Draped

GALORE Testing - Regolith Melt Testing

A team investigating molten regolith electrolysis prepares to test a reactor inside a laboratory in the Neil Armstrong Operations and Checkout Building at NASA’s Kennedy Space Center in Florida on Oct. 29, 2020. The Gaseous Lunar Oxygen from Regolith Electrolysis (GaLORE) project seeks to develop technology to extract oxygen and metals from the crushed rock, or regolith, that covers the Moon’s surface. As NASA prepares to land the first woman and the next man on the Moon in 2024 as part of the Artemis program, technology such as this can assist with sustainable human lunar exploration and long-duration missions to Mars. GaLORE was selected as an Early Career Initiative project by the agency’s Space Technology Mission directorate.

Chappy Oblique

Looking east to west across the rim and down into Chaplygin crater reveals this beautiful example of a fresh young crater and its perfectly preserved ejecta blanket. The delicate patterns of flow across, over, and down local topography clearly show that ejecta traveled as a ground hugging flow for great distances, rather than simply being tossed out on a ballistic trajectory. Very near the rim lies a dark, lacy, discontinuous crust of now frozen impact melt. Clearly this dark material is on top of the bright material so it was the very last material ejected from the crater. The melt was formed as the tremendous energy of impact was converted to heat and the lunar crust was melted at the impact point. As the crater rebounded and material sloughed down the walls of the deforming crater the melt was splashed out over the rim and froze. Its low reflectance is mostly due to a high percentage of glass because the melt cooled so quickly that minerals did not have time to crystallize. The fact that the delicate splash patterns are so well preserved testifies to the very young age of this crater. But how young? For comparison "Chappy" (informal name) is 200 m larger than Meteor crater (1200 m diameter) in Arizona, which is about 50,000 years old. Craters of this size form every 100,000 years or so on the Moon and the Earth. Since there are very few superposed craters on Chappy, and its ejecta is so perfectly preserved it may be much younger than Meteor crater. However, we can't know the true true absolute age of "Chappy" until we can obtain a sample of its impact melt for radiometric age dating. Investigate all of Chappy's ejecta, at full resolution: <a href="http://lroc.sese.asu.edu/posts/901" rel="nofollow">lroc.sese.asu.edu/posts/901</a> Credit: NASA/Goddard/Arizona State University/LRO/LROC

Chappy Oblique

Looking east to west across the rim and down into Chaplygin crater reveals this beautiful example of a fresh young crater and its perfectly preserved ejecta blanket. The delicate patterns of flow across, over, and down local topography clearly show that ejecta traveled as a ground hugging flow for great distances, rather than simply being tossed out on a ballistic trajectory. Very near the rim lies a dark, lacy, discontinuous crust of now frozen impact melt. Clearly this dark material is on top of the bright material so it was the very last material ejected from the crater. The melt was formed as the tremendous energy of impact was converted to heat and the lunar crust was melted at the impact point. As the crater rebounded and material sloughed down the walls of the deforming crater the melt was splashed out over the rim and froze. Its low reflectance is mostly due to a high percentage of glass because the melt cooled so quickly that minerals did not have time to crystallize. The fact that the delicate splash patterns are so well preserved testifies to the very young age of this crater. But how young? For comparison "Chappy" (informal name) is 200 m larger than Meteor crater (1200 m diameter) in Arizona, which is about 50,000 years old. Craters of this size form every 100,000 years or so on the Moon and the Earth. Since there are very few superposed craters on Chappy, and its ejecta is so perfectly preserved it may be much younger than Meteor crater. However, we can't know the true true absolute age of "Chappy" until we can obtain a sample of its impact melt for radiometric age dating. Credit: NASA/Goddard/Arizona State University/LRO/LROC

Chappy Oblique

Looking east to west across the rim and down into Chaplygin crater reveals this beautiful example of a fresh young crater and its perfectly preserved ejecta blanket. The delicate patterns of flow across, over, and down local topography clearly show that ejecta traveled as a ground hugging flow for great distances, rather than simply being tossed out on a ballistic trajectory. Very near the rim lies a dark, lacy, discontinuous crust of now frozen impact melt. Clearly this dark material is on top of the bright material so it was the very last material ejected from the crater. The melt was formed as the tremendous energy of impact was converted to heat and the lunar crust was melted at the impact point. As the crater rebounded and material sloughed down the walls of the deforming crater the melt was splashed out over the rim and froze. Its low reflectance is mostly due to a high percentage of glass because the melt cooled so quickly that minerals did not have time to crystallize. The fact that the delicate splash patterns are so well preserved testifies to the very young age of this crater. But how young? For comparison "Chappy" (informal name) is 200 m larger than Meteor crater (1200 m diameter) in Arizona, which is about 50,000 years old. Craters of this size form every 100,000 years or so on the Moon and the Earth. Since there are very few superposed craters on Chappy, and its ejecta is so perfectly preserved it may be much younger than Meteor crater. However, we can't know the true true absolute age of "Chappy" until we can obtain a sample of its impact melt for radiometric age dating. Credit: NASA/Goddard/Arizona State University/LRO/LROC

Chappy Oblique

Looking east to west across the rim and down into Chaplygin crater reveals this beautiful example of a fresh young crater and its perfectly preserved ejecta blanket. The delicate patterns of flow across, over, and down local topography clearly show that ejecta traveled as a ground hugging flow for great distances, rather than simply being tossed out on a ballistic trajectory. Very near the rim lies a dark, lacy, discontinuous crust of now frozen impact melt. Clearly this dark material is on top of the bright material so it was the very last material ejected from the crater. The melt was formed as the tremendous energy of impact was converted to heat and the lunar crust was melted at the impact point. As the crater rebounded and material sloughed down the walls of the deforming crater the melt was splashed out over the rim and froze. Its low reflectance is mostly due to a high percentage of glass because the melt cooled so quickly that minerals did not have time to crystallize. The fact that the delicate splash patterns are so well preserved testifies to the very young age of this crater. But how young? For comparison "Chappy" (informal name) is 200 m larger than Meteor crater (1200 m diameter) in Arizona, which is about 50,000 years old. Craters of this size form every 100,000 years or so on the Moon and the Earth. Since there are very few superposed craters on Chappy, and its ejecta is so perfectly preserved it may be much younger than Meteor crater. However, we can't know the true true absolute age of "Chappy" until we can obtain a sample of its impact melt for radiometric age dating. Investigate all of Chappy's ejecta, at full resolution: <a href="http://lroc.sese.asu.edu/posts/901" rel="nofollow">lroc.sese.asu.edu/posts/901</a> Credit: NASA/Goddard/Arizona State University/LRO/LROC

Crystal Growth in magnetic fields, a float-zone sample, the surface tension of the melt keeps the sample suspended between the sample rods in the furnace forming an actual liquid bridge. Principal Investigator: Dr. Frank Szofran

Microgravity

ADVANCED MANUFACTURING TEAM

NASA Airborne Snow Observatory is two instruments combined that provides information on every patch of snow, including how deep it is and how fast it melting. This is a frame from an animation.

Measuring Snowpack from the Sky

These holes, captured on Alaska's Matanuska Glacier in July 2012, are formed by cryoconite – dust particles that melt into the ice over time, eventually forming small pockets of water below the glacier's surface. Scientists believe similar pockets of water – called cryoconite holes on Earth – could form within dusty water ice on Mars. https://photojournal.jpl.nasa.gov/catalog/PIA26409

Cryoconite Holes on Matanuska Glacier

Microgravity

While the microgravity environment of orbit eliminates a number of effects that impede the formation of materials on Earth, the change can also cause new, unwanted effects. A mysterious phenomenon, known as detached solidification, apparently stems from a small hydrostatic force that turns out to be pervasive. The contact of the solid with the ampoule transfers stress to the growing crystal and causing unwanted dislocations and twins. William Wilcox and Liya Regel of Clarkson University theorize that the melt is in contact with the ampoule wall, while the solid is not, and the melt and solid are cornected by a meniscus. Their work is sponsored by NASA's Office of Biological and Physical Researcxh, and builds on earlier work by Dr. David Larson of the State University of New York at Stony Brook.

Microgravity

Typical metal sample that was processed by TEMPUS (Tiegelfreies Elektromagnetisches Prozessieren Unter Schwerelosigkeit), an electromagnetic levitation facility developed by German researchers and flown on the IML-2 and MSL-1 and 1R Spacelab missions. Electromagnetic levitation is used commonly in ground-based experiments to melt and then cool metallic melts below their freezing points without solidification occurring. Sample size is limited in ground-based experiments. Research with TEMPUS aboard Spacelab allowed scientists to study the viscosity, surface tension, and other properties of several metals and alloys while undercooled (i.e., cooled below their normal solidification points). The sample is about 1 cm (2/5 inch) in diameter.

Microgravity

Advanced finite element models are used to study three-dimensional, time-dependent flow and segregation in crystal growth systems. In this image of a prototypical model for melt and crystal growth, pathlines at one instant in time are shown for the flow of heated liquid silicon in a cylindrical container. The container is subjected to g-jitter disturbances along the vertical axis. A transverse magnetic field is applied to control them. Such computations are extremely powerful for understanding melt growth in microgravity where g-jitter drives buoyant flows. The simulation is part of the Theoretical Analysis of 3D, Transient Convection and Segregation in Microgravity Bridgman Crystal Growth investigation by Dr. Jeffrey J. Derby of the University of Mirnesota, Minneapolis.

Hokusai Spectacular!

Hokusai crater's rays extend across much of the planet, but its interior is spectacular in its own right. This series of oblique images from NASA's MESSENGER spacecraft shows the central peaks, beautiful terraces, and frozen sea of impact melt on the crater floor. Instrument: Mercury Dual Imaging System (MDIS) Center Latitude: 57.8° Center Longitude: 16.8° E Scale: Hokusai crater is 114 km (71 miles) in diameter http://photojournal.jpl.nasa.gov/catalog/PIA19406

International Space Station (ISS)

Expedition Five flight engineer Peggy Whitson is shown installing the Solidification Using a Baffle in Sealed Ampoules (SUBSA) experiment in the Microgravity Science Glovebox (MSG) in the Destiny laboratory aboard the International Space Station (ISS). SUBSA examines the solidification of semiconductor crystals from a melted material. Semiconductor crystals are used for many products that touch our everyday lives. They are found in computer chips, integrated circuits, and a multitude of other electronic devices, such as sensors for medical imaging equipment and detectors of nuclear radiation. Materials scientists want to make better semiconductor crystals to be able to further reduce the size of high-tech devices. In the microgravity environment, convection and sedimentation are reduced, so fluids do not remove and deform. Thus, space laboratories provide an ideal environment of studying solidification from the melt. This investigation is expected to determine the mechanism causing fluid motion during production of semiconductors in space. It will provide insight into the role of the melt motion in production of semiconductor crystals, advancing our knowledge of the crystal growth process. This could lead to a reduction of defects in semiconductor crystals produced in space and on Earth.