Expedition 43 NASA Astronaut Scott Kelly dons his Russian sokol suit during the Soyuz TMA-16M spacecraft fit check with Russian Cosmonauts Gennady Padalka and, Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), Sunday, March 15, 2015 at the Baikonur Cosmodrome in Kazakhstan. The trio are preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Victor Zelentsov)

NASA Glenn Mechanic Thomas Thompson checks the nose wheel axle nut on NASA Glenn’s Learjet 25 research aircraft.

MENTOR PROTÉGÉ AGREEMENT SIGNING CEREMONY, DECEMBER 7, 2015 L TO R STANDING: STEVE MILEY, TYLER COCHRAN, STEVE WOFFORD, DAVID BROCK (ALL NASA) L TO R SEATED: DANIEL ADAMSKI (AEROJET ROCKETDYNE), JOE MCCOLLISTER (NASA), EDWINA CIOFFI (ICO RALLY)

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

This image is located just inside the southern rim of Chong Chol crater and was obtained on April 25, 2015, the day following NASA MESSENGER final orbital correction maneuver. The spacecraft fuel tanks are now completely empty, and there is no means to prevent the Sun's gravity from pulling MESSENGER's orbit closer and closer to the surface of Mercury. Impact is expected to occur on April 30, 2015. The image is located just inside the southern rim of Chong Chol crater, named for a Korean poet of the 1500s. It is challenging to obtain good images when the spacecraft is very low above the planet, because of the high speed at which the camera's field of view is moving across the surface. Very short exposure times are used to limit smear, and this image was binned from its original size of 1024 x 1024 pixels to 512 x 512 to improve the image quality. The title of today's image is a line from "September Song" (composed by Kurt Weill, with lyrics by Maxwell Anderson. The song was subsequently covered by artists including Ian McCulloch of Echo & the Bunnymen, Lou Reed, and Bryan Ferry). Date acquired: April 25, 2015 Image Mission Elapsed Time (MET): 72264694 Image ID: 8392292 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: 45.43° N Center Longitude: 298.62° E Resolution: 2.1 meters/pixel Scale: The scene is about 2.1 km (1.3 miles) across. This image has not been map projected. Incidence Angle: 69.9° Emission Angle: 20.1° Phase Angle: 90.0° http://photojournal.jpl.nasa.gov/catalog/PIA19436

Earth observation taken during a night pass by the Expedition 43 crew aboard the International Space Station (ISS).

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

One of the most intriguing features on Ceres, Occator crater, is seen in this oblique view from NASA's Dawn spacecraft. This crater is 60 miles (90 kilometers) across and 2 miles (4 kilometers) deep, and is home to the brightest areas on Ceres. This image was acquired from an altitude of 915 miles (1,470 kilometers). Dawn took this image on Oct. 18, 2015. http://photojournal.jpl.nasa.gov/catalog/PIA20132

The 230-foot 70-meter DSS-14 antenna at Goldstone, Ca. obtained these radar images of asteroid 2015 TB145 on Oct. 31, 2015. Asteroid 2015 TB145 is depicted in eight individual radar images collected on Oct. 31, 2015 between 5:55 a.m. PDT (8:55 a.m. EDT) and 6:08 a.m. PDT (9:08 a.m. EDT). At the time the radar images were taken, the asteroid was between 440,000 miles (710,000 kilometers) and about 430,000 miles (690,000 kilometers) distant. Asteroid 2015 TB145 safely flew past Earth on Oct. 31, at 10:00 a.m. PDT (1 p.m. EDT) at about 1.3 lunar distances (300,000 miles, 480,000 kilometers). To obtain the radar images, the scientists used the 230-foot (70-meter) DSS-14 antenna at Goldstone, California, to transmit high power microwaves toward the asteroid. The signal bounced of the asteroid, and their radar echoes were received by the National Radio Astronomy Observatory's 100-meter (330-foot) Green Bank Telescope in West Virginia. The images achieve a spatial resolution of about 13 feet (4 meters) per pixel. http://photojournal.jpl.nasa.gov/catalog/PIA20043

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color image shows the edge of the northwestern flank of Tyrrhenus Mons. Orbit Number: 9509 Latitude: -20.2209 Longitude: 104.956 Instrument: VIS Captured: 2004-02-05 07:30 http://photojournal.jpl.nasa.gov/catalog/PIA19749

Lockheed Martin team completes the closeout weld of the pathfinder pressure vessel at NASA's Michoud Assembly Facility in New Orleans on Nov. 15, 2015. The pathfinder welds demonstrated the tools and processes required to safely perform the 7 welds required to assemble the pressure vessel for Artemis I. Part of Batch image transfer from Flickr.

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

Christine Bonniksen, SMAP program executive with the Science Mission Directorate’s Earth Science Division, NASA Headquarters, left, Kent Kellogg, SMAP project manager, NASA Jet Propulsion Laboratory (JPL), second from left, Dara Entekhabi, SMAP science team lead, Massachusetts Institute of Technology, second from right, and Brad Doorn, SMAP applications lead, Science Mission Directorate’s Applied Sciences Program, NASA Headquarters, right, are seen during a briefing about the upcoming launch of the Soil Moisture Active Passive (SMAP) mission, Thursday, Jan. 08, 2015, at NASA Headquarters in Washington DC. The mission is scheduled for a Jan. 29 launch from Vandenberg Air Force Base in California, and will provide the most accurate, highest-resolution global measurements of soil moisture ever obtained from space. The data will be used to enhance scientists' understanding of the processes that link Earth's water, energy and carbon cycles. Photo Credit: (NASA/Aubrey Gemignani)

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

The Orion team visits Paradigm, a precision parts manufacturer in Colorado on July 15, 2015. Part of Batch image transfer from Flickr.

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

Sunset colors the horizon to the east as the SpaceX Falcon 9 rocket climbs away from Space Launch Complex 40 at Florida’s Cape Canaveral Air Force Station. On board is NOAA’s Deep Space Climate Observatory spacecraft, or DSCOVR. Liftoff occurred at 6:03 p.m. EST. DSCOVR is a partnership between NOAA, NASA and the U.S. Air Force, and will maintain the nation's real-time solar wind monitoring capabilities. To learn more about DSCOVR, visit http://www.nesdis.noaa.gov/DSCOVR. Photo credit: NASA/Kim Shiflett

Images of Pluto taken by NASA New Horizons spacecraft before closest approach on July 14, 2015, reveal features as small as 270 yards (250 meters) across, from craters to faulted mountain blocks, to the textured surface of the vast basin informally called Sputnik Planum. Enhanced color has been added from the global color image. This image is about 330 miles (530 kilometers) across. http://photojournal.jpl.nasa.gov/catalog/PIA19955

In this photo, spacecraft specialists at Lockheed Martin Space Systems, Denver, are reaching up to guide lowering of the parachute cone for installation onto NASA's InSight spacecraft. The photo was taken on April 29, 2015. InSight's parachute, stowed inside the cone, will provide deceleration in the Martian atmosphere. Its role will come after atmospheric friction with the spacecraft's heat shield provides initial deceleration and before thrusters on the lander provide final deceleration. InSight, for Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport, is scheduled for launch in March 2016 and landing in September 2016. It will study the deep interior of Mars to advance understanding of the early history of all rocky planets, including Earth. Note: After thorough examination, NASA managers have decided to suspend the planned March 2016 launch of the Interior Exploration using Seismic Investigations Geodesy and Heat Transport (InSight) mission. The decision follows unsuccessful attempts to repair a leak in a section of the prime instrument in the science payload. http://photojournal.jpl.nasa.gov/catalog/PIA19669

CAPE CANAVERAL, Fla. – Tom Berger, director of the NOAA Space Weather Prediction Center, prepares to brief media on preparations for the liftoff of NOAA’s Deep Space Climate Observatory spacecraft, or DSCOVR. DSCOVR will launch aboard a SpaceX Falcon 9 rocket. The mission is a partnership between NOAA, NASA and the U.S. Air Force. DSCOVR will maintain the nation's real-time solar wind monitoring capabilities which are critical to the accuracy and lead time of NOAA's space weather alerts and forecasts. To learn more about DSCOVR, visit http://www.nesdis.noaa.gov/DSCOVR. Photo credit: NASA/Jim Grossman

NASA Mars Exploration Rover Opportunity obtained this view from the top of the Cape Tribulation segment of the rim of Endeavour Crater. The rover reached this point three weeks before the 11th anniversary of its January 2004 landing on Mars.

ISS044E079682 (09/01/2015) --- NASA Astronaut Scott Kelly works inside the U.S. Destiny Laboratory. Destiny is the primary research laboratory for U.S. payloads, supporting a wide range of experiments and studies contributing to health, safety and quality of life for people all over the world.

iss043e286992 (6/6/2015) --- Photographic documentation of the Bone Densitometer Validation experiment in support of Rodent Research 2 (RR2) experiment. Bone Densitometer Hardware Validation (Bone Densitometer Validation) tests an X-ray device the size of a kitchen microwave oven, which measures bone density, muscle and fat in mice living on the International Space Station.

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color image shows part of Acidalia Planitia. Orbit Number: 11833 Latitude: 45.9694 Longitude: 5.75958 Instrument: VIS Captured: 2004-08-14 17:19 http://photojournal.jpl.nasa.gov/catalog/PIA19792

The first color movies from NASA's New Horizons mission show Pluto and its largest moon, Charon, and the complex orbital dance of the two bodies, known as a double planet. A near-true color movie was assembled from images made in three colors -- blue, red and near-infrared -- by the Multispectral Visible Imaging Camera on the instrument known as Ralph. The images were taken on nine different occasions from May 29-June 3, 2015. The movie is barycentric, meaning that both Pluto and Charon are shown in motion around the binary's barycenter -- the shared center of gravity between the two bodies as they do a planetary jig. Because Pluto is much more massive than Charon, the barycenter (marked by a small "x" in the movie) is much closer to Pluto than to Charon. Looking closely at the images in this movie, one can detect a regular shift in Pluto's brightness-due to the brighter and darker terrains on its differing faces. http://photojournal.jpl.nasa.gov/catalog/PIA19688

Visitors at NASA's Michoud Assembly Facility in New Orleans see the historic model room, the space shuttle external tank, and the most current progress on NASA's Orion and SLS vehicles on Aug. 6, 2015. Part of Batch image transfer from Flickr.

AS THE END OF CONSTRUCTION ON TEST STAND 4697, THE LIQUID OXYGEN TANK TEST STAND AT MARSHALL SPACE FLIGHT CENTER, PROJECT ENGINEERS PHIL HENDRIX, FROM MSFC, AND CURTNEY WALTERS FROM THE U.S. CORP OF ENGINEERS, STUDY PLANS AND PROGRESS.

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

CAPE CANAVERAL, Fla. – In the Neil Armstrong Operations and Checkout Building high bay at NASA's Kennedy Space Center in Florida, NASA Administrator Charlie Bolden delivers a “state of the agency” address at NASA's televised fiscal year 2016 budget rollout event. Kennedy Space Center Director Bob Cabana looks on, at right. Representatives from the Kennedy workforce, news media and social media were in attendance. NASA's Orion, SpaceX Dragon and Boeing CST-100 spacecraft, all destined to play a role in NASA’s overall exploration objectives, were on display. For information on NASA's budget, visit http://www.nasa.gov/budget. Photo credit: NASA/Gianni Woods

ISS042E237302 (02/09/2015) --- Aboard the International Space Station on Feb. 9, 2015 NASA astronaut Terry Virts while viewing through the Cupola window captured this image of the African continent. Virts tweeted the photo to his many fans with the comment: "Sun glint on one of a thousand rivers in the heart of #Africa, this one in #Angola" .

This image of Ceres is part of a sequence taken by NASA Dawn spacecraft on May 7, 2015, from a distance of 8,400 miles 13,600 kilometers. http://photojournal.jpl.nasa.gov/catalog/PIA19554

ISS042E135486 (01/10/2015) --- Just another sunny day in the Caribbean sea as viewed by astronauts aboard the International Space Station. This image was tweeted out by NASA astronaut Terry Virts as he captured the Earth observation of #Cuba and #Bahamas on Jan. 10, 2015.

This image from NASA Mars Reconnaissance Orbiter is part of a proposed landing site in Aram Dorsum for the ExoMars Rover, planned for launch in 2018. Upper layers of light toned sediments have been eroded, leaving a lower surface which appears dark. The retreating sediment scarp slopes would be an important target for the rover if it ends up going to Aram Dorsum. The retreating scarps will be relatively recent compared to the ancient age of the terrain. That means that organic compounds-which is what ExoMars is designed to drill to 2 meters depth and analyze-will not have been exposed to the full effects of solar and galactic radiation for their entire history. Such radiation can break down organic compounds. Prior to this later erosion, the rocks formed in the ancient, Noachian era as alluvial deposits of fine grained sediment. http://photojournal.jpl.nasa.gov/catalog/PIA19859

CAPE CANAVERAL, Fla. -- NASA Administrator Charlie Bolden looked over the agency's Orion spacecraft this morning for the first time since it returned to Kennedy Space Center following the successful Orion flight test on Dec. 5. At right is Jules Schneider, Lockheed Martin manager. At left is Kennedy Space Center Associate Director Kelvin Manning. Bearing the marks of a spacecraft that has returned to Earth through a searing plunge into the atmosphere, Orion is perched on a pedestal inside the Launch Abort System Facility at Kennedy where it is going through post-mission processing. Although the spacecraft Bolden looked over did not fly with a crew aboard during the flight test, Orion is designed to carry astronauts into deep space in the future setting NASA and the nation firmly on the journey to Mars. Photo credit: NASA/Cory Huston

jsc2020e040942 (4/18/2015) --- Copper zirconium alloy wire. The Exposure Experiment of Copper-Zirconium Antenna Metal Mesh to the Space Environment (ExHAM-Antenna Metal Mesh) investigation tests how well an antenna metal mesh, made from copper and zirconium, performs in the space environment in low-Earth orbit (LEO). While in space, the antenna metal mesh is exposed to cosmic rays and atomic oxygen in the LEO space environment - which can degrade antenna performance. Image Credit: NGK Insulators, Ltd., Taiyo Wire Cloth Co., Ltd., Technosolver Corporation, Koyo Materica Corporation, JAXA..

NASA astronaut Terry Virts of Expedition 43 on the International Space Station checks the remote control Canadarm2 on Apr.26, 2015. The Canadarm 2 is used to grapple arriving spacecraft and moving them to their docking ports.

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

Aerial photos of NASA Langley employees gathered on the back ramp in the shape of 100.

CAPE CANAVERAL, Fla. -- In the Kennedy Space Center’s Press Site auditorium, agency and industry leaders spoke to members of the news media on International Space Station research and technology developments. Participants included Cheryl Nickerson of Arizona State University, and principal investigator for the Micro-5 experiment. Photo credit: NASA/ Kim Shiflett

In southern Syria, the Azraq-Wadi as Sirhan Depression is the site of young volcanic activity, producing an extensive basaltic volcanic field. The north-northwest to south-southeast structural and fault control of the crust is evident in the straight alignment of numerous chains of cinder cones. At the top of the image, the northeast trending streaks are windblown sand deposits. The image was acquired May 20, 2009, covers an area of 46.5 x 67 km, and is located at 33.3 degrees north, 37.1 degrees east. http://photojournal.jpl.nasa.gov/catalog/PIA19479

VANDENBERG AFB, California – A convoy assembles to take NASA's SMAP spacecraft from the Astrotech processing facility to Space Launch Complex-2 for placement atop a Delta II rocket for launch. For more, go to www.nasa.gov/smap Photo credit: USAF

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

DUAL ION SPECTROMETER (DIS) ENGINEERING TEST UNIT (ETU) AT THE LOW ENERGY ELECTRON AND ION FACILITY (LEEIF), NSSTC

Orion leadership visits Aerojet Rocketdyne in Sacramento, CA on March 3, 2015 to recognize the great work performed in support of Orion's first flight, Exploration Flight Test-1 (EFT-1). Part of Batch image transfer from Flickr.

MAF Orion MGMT Visit

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

NASA Mars Reconnaissance Orbite observed this image of an isolated mountain in the Southern highlands reveals a large exposure of purplish bedrock. Since HiRISE color is shifted to longer wavelengths than visible color and given relative stretches, this really means that the bedrock is roughly dark in the broad red bandpass image compared to the blue-green and near-infrared bandpass images. In the RGB (red-green-blue) color image, which excludes the near-infrared bandpass image, the bedrock appears bluish in color. This small mountain is located near the northeastern rim of the giant Hellas impact basin, and could be impact ejecta. http://photojournal.jpl.nasa.gov/catalog/PIA19854

VANDENBERG AIR FORCE BASE, Calif. – Technicians prepare to lift NASA's Soil Moisture Active Passive, or SMAP, spacecraft in preparation to move it toward the Delta II payload attach structure in the Astrotech payload processing facility on Vandenberg Air Force Base in California. The structure will secure the spacecraft to the rocket's second stage. SMAP will launch on a Delta II 7320 configuration vehicle featuring a United Launch Alliance first stage booster powered by an Aerojet Rocketdyne RS-27A main engine and three Alliant Techsystems, or ATK, strap-on solid rocket motors. Once on station in Earth orbit, SMAP will provide global measurements of soil moisture and its freeze_thaw state. These measurements will be used to enhance understanding of processes that link the water, energy and carbon cycles, and to extend the capabilities of weather and climate prediction models. SMAP data also will be used to quantify net carbon flux in boreal landscapes and to develop improved flood prediction and drought monitoring capabilities. Launch from Space Launch Complex 2 is targeted for Jan. 29, 2015. To learn more about SMAP, visit http:__www.nasa.gov_smap. Photo credit: NASA_Chris Wiant, U.S. Air Force Photo Squadron

Seasonal flows called recurring slope lineae RSL grow down warm slopes in the summer, fade when they become inactive, then re-form the following year when the slopes warm up again from the Sun. This observation is from NASA Mars Reconnaissance Orbiter

The Orion leadership visited Ames Research Center in California on March 2, 2015 to recognize the great work performed at the center in support of Orion's first flight, Exploration Flight Test-1 (EFT-1). Part of Batch image transfer from Flickr.

The Soyuz rocket and Soyuz TMA-16M spacecraft are assembled at Building 112 on the Baikonur Cosmodrome on Tuesday, March 24, 2015 in Baikonur, Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Victor Zelentsov)

Buildings 7 & 29. Explore@NASAGoddard celebrates the 25th anniversary of the launch of the Hubble Space Telescope. All areas of Goddard’s research – Earth science, heliophysics, planetary science, astrophysics, and engineering and technology – will be presented, as each discipline plays a critical part in NASA's ongoing journey to reach new heights.

This image of Ceres is part of a sequence taken by NASA Dawn spacecraft on May 7, 2015, from a distance of 8,400 miles 13,600 kilometers. http://photojournal.jpl.nasa.gov/catalog/PIA19558

Teams perform a series of tests at NASA’s Neutral Buoyancy Laboratory (NBL) at the agency’s Johnson Space Center in Houston on Oct. 7, 2015, to evaluate the most efficient way for astronauts to get out of the Orion spacecraft after weeks or months away from Earth. Part of Batch image transfer from Flickr.

Expedition 42 Cosmonaut Elena Serova of the Russian Federal Space Agency (Roscosmos) is carried into terrain vehicle (ATV) shortly after she and NASA Astronaut Barry Wilmore of NASA, and Alexander Samokutyaev of Roscosmos landed in their Soyuz TMA-14M spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, March 12, 2015. NASA Astronaut Wilmore, Russian Cosmonauts Samokutyaev and Serova are returning after almost six months onboard the International Space Station where they served as members of the Expedition 41 and 42 crews. Photo Credit: (NASA/Bill Ingalls)

This image, taken by NASA's Dawn spacecraft, shows the surface of dwarf planet Ceres from an altitude of 915 miles (1,470 kilometers). The image, with a resolution of 450 feet (140 meters) per pixel, was taken on August 26, 2015. http://photojournal.jpl.nasa.gov/catalog/PIA19896

CAPE CANAVERAL, Fla. – SpaceX rocket lifts off from Space Launch Complex 40 at Cape Canaveral Air Force Station carrying the Dragon resupply spacecraft to the International Space Station. Liftoff was at 4:47 a.m. EST. The commercial resupply mission will deliver 3,700 pounds of scientific experiments, technology demonstrations and supplies, including critical materials to support 256 science and research investigations that will take place on the space station. Photo credit: NASA/Kevin O'Connel & Tony Gray

This artist concept shows NASA fleet of observatories busily gathering data before and after July 14, 2015 to help piece together what we know about Pluto, and what features New Horizons data might help explain. What's icy, has "wobbly" potato-shaped moons, and is arguably the world's favorite dwarf planet? The answer is Pluto, and NASA's New Horizons is speeding towards the edge of our solar system for a July 14 flyby. It won't be making observations alone; NASA's fleet of observatories will be busy gathering data before and after to help piece together what we know about Pluto, and what features New Horizons data might help explain. http://photojournal.jpl.nasa.gov/catalog/PIA19703

A security van is seen surveying the launch pad area ahead of the Soyuz TMA-16M spacecraft arrival by train, Wednesday, March 25, 2015, Baikonur Cosmodrome, Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

CORE STAGE SIMULATOR, BLDG. 4755, SOUTH HIGHBAY, JANUARY 13, 2015

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

ISS045e019776 (09/19/2015) --- International Space Station Expedition 45 crewmembers watch an advance screening of "The Martian" movie in the Unity Node 1. Clockwise from left, are Russian cosmonauts flight engineers Oleg Kononenko and Sergei Volkov, NASA astronaut Commander Scott Kelly, and cosmonaut Mikhail Kornienko. This image was released on social media.

Some might see a pancake, and others a sand dollar, in this new image from NASA Dawn mission. Astronomers are puzzling over a mysterious large circular feature located south of the equator and slightly to the right of center in this view.

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 46-47 crewmember Tim Kopra of NASA signs in for his qualification exam Nov. 20 as his crewmate, Tim Peake of the European Space Agency looks on. Along with Yuri Malenchenko of the Russian Federal Space Agency (Roscosmos), Kopra and Peake will launch Dec. 15 on their Soyuz TMA-19M spacecraft Dec. 15 from the Baikonur Cosmodrome in Kazakhstan for a six-month mission on the International Space Station. NASA/Seth Marcantel

Expedition 43 NASA Astronaut Scott Kelly smiles during an Soyuz TMA-16M Trajectory and Flight Plan briefing, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Kelly, and Russian Cosmonauts Gennady Padalka and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

This image from NASA Mars Reconnaissance Orbiter spacecraft shows the nature of the terrain at the rim of Marth Crater. In the book "The Martian" by Andy Weir, stranded astronaut Mark Watney is headed for the Ares 4 landing site but encounters the rim of Marth Crater just as a dust storm arrives. This HiRISE image shows the nature of this terrain. The crater rim is not very distinct and from the ground it would be quite difficult to tell that you are even on the rim of a crater. The terrain is hummocky and rolling, punctuated by smaller impact craters and wind-blown drifts of sand or dust. http://photojournal.jpl.nasa.gov/catalog/PIA19959

Sand dunes on the floor of Rabe Crater are brighter in this infrared image from NASA 2001 Mars Odyssey spacecraft than the surrounding materials. This is because the sand is warmer than the surrounding rock. Orbit Number: 57712 Latitude: -43.7612 Longitude: 34.3755 Instrument: IR Captured: 2014-12-17 17:16 http://photojournal.jpl.nasa.gov/catalog/PIA19189

VANDENBERG AFB, California – NASA's SMAP spacecraft inside the service structure at Space Launch Complex-2 at Vandenberg AFB, California. For more, go to www.nasa.gov/smap Photo credit: USAF

There are many knob formations is the southeastern Acidalia region of Mars. All show a hilltop crest except one which has a summit crater that resembles a cone volcano in this image captured by NASA Mars Reconnaissance Orbiter.

Launch Vehicle Stage Adapter (LVSA) Aft Cone Post Weld #7

This image of Ceres is part of a sequence taken by NASA Dawn spacecraft on May 16, 2015, from a distance of 4,500 miles 7,200 kilometers. http://photojournal.jpl.nasa.gov/catalog/PIA19559

This scene captured by NASA Mars Reconnaissance Orbiter includes chaotic deposits with a wide range of colors. The deposits are distinctive with both unique colors and small-scale textures such as fracture patterns. These are probably sedimentary rocks, transported and deposited in water or air. The original layers may have been jumbled in a landslide. Dark or reddish sand dunes cover some of the bedrock. http://photojournal.jpl.nasa.gov/catalog/PIA19860

This graphic depicts the relative shapes and distances from Mars for five active orbiter missions plus the planet's two natural satellites. It illustrates the potential for intersections of the spacecraft orbits. The number of active orbiter missions at Mars increased from three to five in 2014. With the increased traffic, NASA has augmented a process for anticipating orbit intersections and avoiding collisions. NASA's Mars Odyssey and MRO (Mars Reconnaissance Orbiter) travel near-circular orbits. The European Space Agency's Mars Express, NASA's MAVEN (Mars Atmosphere and Volatile Evolution) and India's MOM (Mars Orbiter Mission), travel more elliptical orbits. Phobos and Deimos are the two natural moons of Mars. http://photojournal.jpl.nasa.gov/catalog/PIA19396

An elongated crater called "Spirit of St. Louis," with a rock spire in it, dominates a recent scene from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity. Opportunity completed its 4,000 Martian day, or sol, of work on Mars on April 26, 2015. The rover has been exploring Mars since early 2004. This scene from late March 2015 shows a shallow crater called Spirit of St. Louis, about 110 feet (34 meters) long and about 80 feet (24 meters) wide, with a floor slightly darker than surrounding terrain. The rocky feature toward the far end of the crater is about 7 to 10 feet (2 to 3 meters) tall, rising higher than the crater's rim. The component images of this mosaic view were taken on March 29 and 30, 2015, during Sol 3973 and Sol 3974 of the mission. This version of the image is presented in approximate true color by combing exposures taken through three of the Pancam's color filters, centered on wavelengths of 753 nanometers (near-infrared), 535 nanometers (green) and 432 nanometers (violet). The unusually shaped Spirit of St. Louis Crater lies on the outer portion of the western rim of Endeavour Crater. Endeavour spans about 14 miles (22 kilometers) in diameter, and Opportunity has been exploring its western rim for about one-third of the rover's mission, which has lasted more than 11 years. Endeavour's elevated western rim extends northward to the left from Spirit of St. Louis Crater in this scene. A glimpse to the far side of Endeavour is visible on either side of the rock spire. http://photojournal.jpl.nasa.gov/catalog/PIA19393

2016 ROVER CHALLENGE EVENTS AT THE U.S. SPACE AND ROCKET CENTER IN HUNTSVILLE, ALABAMA. NATIONAL AND INTERNATIONAL COLLEGE AND HIGH SCHOOL STUDENTS COME TOGETHER TO TEST THEIR ENGINEERING SKILLS OVER A SIMULATED OUTER PLANET OBSTACLE COURSE.

Astronaut Scott Kelly initiated VEG-01 B, the second crop of lettuce, on July, 8, 2015, and both Kelly and Astronaut Kjell Lindgren cared for the plants. The crop grew for 33 days. VEG-01 B included one set of six plant pillows planted with red romaine lettuce seeds. On Aug. 10, 2015, the crew harvested and consumed leaves from each plant. This was the first crop grown and consumed in NASA hardware. They harvested the rest of the plant tissue and froze it in the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) for return to Earth for further study including microbial analysis, antioxidant capacity, mineral analysis and anthocyanin concentration.

This frame from a video shows the bright spots in Occator crater on dwarf planet Ceres, generated from data from NASA Dawn spacecraft. The global view uses data collected by NASA's Dawn mission in April and May 2015. The highest-resolution parts of the map have a resolution of 1,600 feet (480 meters) per pixel. The second portion of the video shows the bright spots in Occator crater, which is about 60 miles (90 kilometers) across and 2 miles (4 kilometers) deep. Vertical relief has been exaggerated by a factor of five. Exaggerating the relief helps scientists understand and visualize the topography more easily, and highlights features that are sometimes subtle. The third portion of the video shows a mountain about 4 miles (6 kilometers) high, which is roughly the elevation of Mount McKinley in Alaska's Denali National Park. Vertical relief has been exaggerated by a factor of five. Exaggerating the relief helps scientists understand and visualize the topography much more easily, and highlights features that are sometimes subtle. The fourth section of the video shows the global view from the first section in 3-D view. A pair of 3-D glasses reveals striking detail in the topography of the dwarf planet. http://photojournal.jpl.nasa.gov/catalog/PIA19619

The Soyuz TMA-16M spacecraft is seen after is was rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March 25, 2015. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Victor Zelentsov)

NASA and Lockheed Martin Orion leadership visits the team at Michoud Assembly Facility in New Orleans, Louisiana to thank them for their efforts in building the Orion spacecraft for Exploration Flight Test-1 (EFT-1) on March 16, 2015. Part of Batch image transfer from Flickr.

The completed barrel and aft bulkhead of the Orion Artemis I pressure vessel at NASA's Michoud Assembly Facility in New Orleans on Nov. 15, 2015. Part of Batch image transfer from Flickr.

Artist concept of the interaction of the solar wind the supersonic outflow of electrically charged particles from the Sun with Pluto predominantly nitrogen atmosphere based on NASA New Horizons SWAP instrument.

LEWIS WOOTEN, NEW DIRECTOR OF THE MISSION OPERATIONS LABORATORY AT NASA'S MARSHALL SPACE FLIGHT CENTER IN HUNTSVILLE, ALABAMA, MANAGES OPERATIONS IN THE PAYLOAD OPERATIONS INTEGRATION CENTER-THE COMMAND POST FOR ALL SCIENCE AND RESEARCH ACTIVITIES ON THE INTERNATIONAL SPACE STATION

Liftoff of the SpaceX Falcon 9 rocket carrying NOAA’s Deep Space Climate Observatory spacecraft, or DSCOVR, is visible in the realtime camera view on the countdown clock at NASA’s Kennedy Space Center in Florida. The Falcon 9 launched from Space Launch Complex 40 at Cape Canaveral Air Force Station at 6:03 p.m. EST. DSCOVR is a partnership between NOAA, NASA and the U.S. Air Force, and will maintain the nation's real-time solar wind monitoring capabilities. To learn more about DSCOVR, visit http://www.nesdis.noaa.gov/DSCOVR. Photo credit: NASA/Frankie Martin

ISS044E012986 (07/13/2015) --- This Night Earth Observation of an Aurora Borealis was captured by NASA astronaut Scott Kelly of Expedition 44 on the International Space Station.

TODD MAY,CHARLIE BOLDEN AND ASTRONAUT BUTCH WILMORE BRIEF NEWS MEDIA ON PROGRESS OF NEW TEST STAND CONSTRUCTION FOR SLS TESTING

Ravines or very large gullies are actively forming on Mars during the coldest times of year, when carbon dioxide frost aids mass wasting as seen by NASA Mars Reconnaissance Orbiter. However, some of these ravines also show activity in the warmest time of year, in the form of recurring slope lineae (RSL); dark, narrow flows in some alcoves that flow part way down the channels. Few topographic changes have been seen in association with RSL, and they appear to be seeps of water that seasonally extend down slopes, then fade when inactive, and recur each warm season. Could the RSL activity carve the ravines? In some places the RSL extend to the ends of the fans and appear to match in scale, and perhaps gradually form the ravines. In other places, such as this image, the ravines are much larger than the RSL, so presently-observed RSL flow did not produce the larger landforms, but maybe the flow was greater in the past or maybe the RSL just follow the topography created by other processes. The largest ravines are on pole-facing slopes in the middle latitudes, where RSL have never been seen to form, unless the ravine creates a small equator-facing slope. http://photojournal.jpl.nasa.gov/catalog/PIA19458

All six Expedition 43 crewmembers are gathered in the Destiny laboratory on board the International Space Station on Mar 30, 2015 after an emergency procedures training period. The six members include Russian cosmonauts Mikhail Kornienko, Anton Shkaplerov, Gennady Padalka, NASA Astronaut Scott Kelly, ESA (European Space Agency) astronaut Samantha Cristoforetti, and Expedition 43 commander US astronaut Terry Virts.