NASA Mars Odyssey spacecraft took this portrait of the Earth and its companion Moon. It was taken at a distance of 3,563,735 kilometers more than 2 million miles on April 19, 2001 as the 2001 Mars Odyssey spacecraft left the Earth.

At 11:02 a.m. EDT on April 7, 2001, crowds watch a Boeing Delta II rocket lift off from Cape Canaveral Air Force Station, Florida, carrying NASA 2001 Mars Odyssey spacecraft into space on its seven-month journey to Mars.

NASA 2001 Mars Odyssey Thermal Emission Imaging System THEMIS acquired these images of the Earth using its visible and infrared cameras as it left the Earth.

NASA's 2001 Mars Odyssey orbiter arrived at Mars on Oct. 24, 2001. Over the past two decades, the mission has mapped the composition of the Martian surface, providing a window to the past so scientists could piece together how the planet evolved. It has also served as a vital asset in relaying communications between landers and rovers at the Red Planet and the mission teams back on Earth. Here are some of the highlights of the last 20 years: Mars Odyssey has completed 80,000 orbits. Mars Odyssey has taken more than 1.2 million images. Mars Odyssey has returned 16 terabits of total science data to Earth, including 1 terabit of data relayed from Mars surface missions. Mars Odyssey has provided communications relay for six Mars surface missions: the Phoenix and InSight landers, as well as the Spirit, Opportunity, Curiosity, and Perseverance rovers. https://photojournal.jpl.nasa.gov/catalog/PIA24915

This NASA 2001 Mars Odyssey image shows part of the floor of Coprates Chasma.

Shalbatana Vallis dominates this image captured by NASA 2001 Mars Odyssey spacecraft.

This 2001 Mars Odyssey THEMIS VIS image shows a landslide in Capri Chasma.

This image captured by NASA 2001 Mars Odyssey shows a portion of Aram Chaos.

This 2001 Mars Odyssey image shows the dune field in Nili Patera.

This 2001 Mars Odyssey image shows dark dunes on the floor of Lamont Crater.

A section of Nanedi Valles is shown in this image captured by NASA 2001 Mars Odyssey.

Windstreaks located in Chryse Planitia as seen by NASA 2001 Mars Odyssey spacecraft.

This image captured by NASA 2001 Mars Odyssey spacecraft spans Candor Chasma.

This 2001 Mars Odyssey image of Capri Chasma shows multiple landslide deposits.

NASA 2001 Mars Odyssey image shows a portion of Nirgal Vallis.

This image captured by NASA 2001 Mars Odyssey shows a portion of Iani Chaos.

This image from NASA 2001 Mars Odyssey shows a section of Sabis Vallis.

This 2001 Mars Odyssey image shows dunes in Aonia Terra.

The linear depression in this image from NASA 2001 Mars Odyssey spacecraft is a graben. The graben in this area of Mars are called Sirenum Fossae.

The orthogonal ridges in this image captured by NASA 2001 Mars Odyssey spacecraft are located near the south polar cap of Mars.

The power of the wind is undeniable in this image of the surface of Mars as seen by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey spacecraftshows a small portion of Kasei Valles, one of the largest channel systems on Mars.

Artist concept of NASA's 2001 Mars Odyssey spacecraft. http://photojournal.jpl.nasa.gov/catalog/PIA04244

NASA's 2001 Mars Odyssey spies what looks likNASA's 2001 Mars Odyssey spies what looks like a barrage of bullets headed its way.e a barrage of bullets headed its way. https://photojournal.jpl.nasa.gov/catalog/PIA21688

This image from NASA 2001 Mars Odyssey of central Utopia Planitia shows some dust devil tracks. These features are common in this region of Mars.

This artist rendering portrays ice-rich layers in the soils of Mars being detected by instruments aboard NASA 2001 Mars Odyssey spacecraft.

This VIS image captured by NASA 2001 Mars Odyssey spacecraft shows a small area just off the margin of Mars southern polar cap.

Spring has arrived at the south pole of Mars. The multitude of layers that make up the cap are readily visible in this image from NASA 2001 Mars Odyssey spacecraft.

Dunes are common at both poles of Mars. These northern pole dunes are still covered in frost, as it is early springtime when this image was acquired by NASA 2001 Mars Odyssey.

This low resolution VIS image from NASA 2001 Mars Odyssey spacecraft shows a large portion of etched terrain near the south pole of Mars.

This image from NASA 2001 Mars Odyssey shows a huge ridge of sand in Russell Crater that makes its dune field one of the most unusual on Mars.

This low resolution VIS image from NASA 2001 Mars Odyssey spacecraft shows a large portion of etched terrain near the south pole of Mars.

This thermal infrared image was acquired by NASA Mars Odyssey spacecraft on October 30, 2001, as the spacecraft orbited Mars on its ninth revolution around the planet.

With southern summer drawing to a close, the surface of the polar ice cap will begin to frost over on Mars as seen by NASA 2001 Mars Odyssey spacecraft.

Some of the youngest volcanic flows on Mars are from Arsia Mons. This image captured by NASA 2001 Mars Odyssey of Daedalia Planum shows some of these flows.

The lava channels in this image from NASA 2001 Mars Odyssey spacecraft are located on the northern flank of Ascraeus Mons.

Several fractures cross through Gorgonum Chaos in this image captured by NASA 2001 Mars Odyssey spacecraft.

This image captured by NASA 2001 Mars Odyssey spacecraft shows part of the interior of Milankovic Crater.

This image captured by NASA 2001 Mars Odyssey spacecraft show windstreaks found on Daedalia Planum.

Wind erosion has created this complex surface south of Olympus Mons as seen by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey spacecraft shows a portion of Nanedi Valles in Xanthe Terra.

These fractures and graben are part of Sirenum Fossae as seen by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey shows a portion of Rhabon Vallis, a channel south of Uranius Mons.

This image taken by NASA 2001 Mars Odyssey shows a small portion of Auqakuh Vallis.

A beautiful delta deposit in Harris Crater is the highlighted feature in this image captured by NASA 2001 Mars Odyssey.

The mega gully in this image from NASA 2001 Mars Odyssey spacecraft empties into Echus Chasma.

The lava channels in this image are located in the Tharsis plains as seen by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey shows channels dissecting the northwestern rim of Holden Crater.

The channels in this image captured by NASA 2001 Mars Odyssey spacecraft are part of Enipeus Vallis.

This image captured by NASA 2001 Mars Odyssey spacecraft shows several of the graben fault bounded depression that are part of Acheron Catena.

Small channels dissect the inner rim of this unnamed crater in Arabia Terra as seen by NASA 2001 Mars Odyssey spacecraft.

Tiu Valles is the location of the streamlined island in this image from NASA 2001 Mars Odyssey spacecraft.

Fractures mark the surface in this region of Margaritifer Terra in this image captured by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey shows the central portion of the complex caldera at the summit of Olympus Mons.

The small channels in this image from NASA 2001 Mars Odyssey spacecraft are located within the much larger Kasei Valles channel.

This image from NASA 2001 Mars Odyssey spacecraft shows sand dunes of the floor of Trouvelot Crater.

Channels dissect the hillside of Terra Sirenum in this image from NASA 2001 Mars Odyssey spacecraft.

This 2001 Mars Odyssey image shows the eastern margin of the sand sheet and dune field on the floor of Rabe Crater.

This image from NASA 2001 Mars Odyssey spacecraft shows a portion of Athabasca Valles.

The unnamed channel in this image from NASA 2001 Mars Odyssey spacecraft is located in northern Tyrrhena Terra.

This image from NASA 2001 Mars Odyssey spacecraft shows a small crater near Phlegra Montes.

These dunes occur on the floor of Holden Crater as seen by NASA 2001 Mars Odyssey spacecraft.

The dissected surface seen in this image from NASA 2001 Mars Odyssey spacecraft is near Warrego Valles.

This image captured by NASA 2001 Mars Odyssey spacecraft shows a portion of two unnamed craters in Terra Sabaea.

This daytime 2001 Mars Odyssey THEMIS infrared image clearly shows the multitude of channels dissecting the rim of Lipik Crater.

This image from NASA 2001 Mars Odyssey shows the eastern flank of Pavonis Mons.

These ridges near the south polar cap are called Angustus Labyrinthus, as shown in this image captured by NASA 2001 Mars Odyssey spacecraft.

The gullies seen in this image taken by NASA 2001 Mars Odyssey spacecraft are located on the western rim region of the Argyre Basin.

This image shows a portion of Utopia Planitia that is covered by dust devil tracks as seen by NASA 2001 Mars Odyssey spacecraft.

Multiple layers of material are located in Terby Crater in this image from NASA 2001 Mars Odyssey.

This small field of sand dunes is located on the floor of an unnamed crater in Terra Cimmeria as seen by NASA 2001 Mars Odyssey spacecraft.

The lava flows in this image captured by NASA 2001 Mars Odyssey spacecraft originated at Pavonis Mons.

This image captured by NASA 2001 Mars Odyssey spacecraft shows a section of Bahram Vallis.

The unnamed channel in this image captured by NASA 2001 Mars Odyssey spacecraft is located on the northeastern margin of Tempe Terra.

The dunes seen in this view from NASA 2001 Mars Odyssey spacecraft are located on the floor of Brashear Crater.

Streamlined islands indicate the direction of flow in this image of Shalbatana Vallis. taken by NASA 2001 Mars Odyssey spacecraft.

This image from NASA 2001 Mars Odyssey spacecraft shows part of the northeastern flank of Elysium Mons.

Small dunes are located on the floor of Darwin Crater as shown in this image from NASA 2001 Mars Odyssey spacecraft.

This complex graben is part of Labeatis Fossae. This image was captured by NASA 2001 Mars Odyssey spacecraft.

The sinuous channel at the bottom of this image captured by NASA 2001 Mars Odyssey spacecraft is called Anio Valles.

This image captured by NASA 2001 Mars Odyssey spacecraft shows a portion of Buvinda Vallis.

This image from NASA 2001 Mars Odyssey spacecraft shows several channels dissecting the rim of Semeykin Crater.

The dunes in this unnamed crater in Aonia Terra are coalescing into a sand sheet in this image from NASA 2001 Mars Odyssey spacecraft.

The dunes in this image captured by NASA 2001 Mars Odyssey spacecraft sare located in the depressions of Sisyphi Cavi.

NASA 2001 Mars Odyssey image shows a field of dark dunes on the floor of an unnamed crater in Terra Cimmeria.

The massive, complex landslide deposits in this image from NASA 2001 Mars Odyssey spacecraft are located on the northern slope of Ophir Chasma.

The landslide deposits in this image captured by NASA 2001 Mars Odyssey spacecraft are located in Baetis Chaos.

This image, taken by NASA 2001 Mars Odyssey spacecraft, shows a small section of Naktong Vallis.

Dark slope streaks mark the hill sides in Lycus Sulci as seen by NASA 2001 Mars Odyssey spacecraft.

The channel in this image captured by NASA 2001 Mars Odyssey spacecraft is a portion of Hrad Vallis.

This image captured by NASA 2001 Mars Odyssey spacecraft is of the northern plains and shows hundreds of dust devil tracks.

Do you see what I see this image captured by NASA 2001 Mars Odyssey spacecraft? A large bumble bee!

This image captured by NASA 2001 Mars Odyssey spacecraft shows a field of dunes on the floor of an unnamed crater in Terra Cimmeria.

Numerous layers within Burroughs Crater are visible in this image captured by NASA 2001 Mars Odyssey spacecraft.

This image captured by NASA 2001 Mars Odyssey spacecraft shows a small section of Reull Vallis.

This 2001 Mars Odyssey image shows multiple landslides are visible in this daytime infrared image of Capri Chasma.

This unnamed as seen by NASA 2001 Mars Odyssey spacecraft channel drains part of Margaritifer Terra.

Many small channels dissect the rim of Martz Crater, as shown in this image captured by NASA 2001 Mars Odyssey spacecraft.

The arcuate or curved fractures in this image are located on the eastern margin of Elysium Planitia as seen by NASA 2001 Mars Odyssey spacecraft.

Odd rimmed depressions are located on the floor of this unnamed crater in Noachis Terra in this 2001 Mars Odyssey THEMIS VIS image.