This image from NASAs Mars Odyssey shows the flank of Tharsis Tholus. The Tharsis region of Mars is dominated by large volcanoes and extensive lava...

This image from NASAs Mars Odyssey shows the plains between Terra Sabaea and Utopia Planitia.

This image from NASAs Mars Odyssey shows the upper flank of Olympus Mons. Olympus Mons is the largest volcano in the solar system.

This image from NASAs Mars Odyssey shows a small portion of Olympia Undae. This large dune field surrounds part of the north polar cap.

This image from NASAs Mars Odyssey shows Olympia Undae, the largest of several dune fields that surround the north polar cap.

This image from NASAs Mars Odyssey shows lava flows from Alba Mons, and a tectonic graben called Cyane Fossae.

This image from NASAs Mars Odyssey shows a section of Shalbatana Vallis. Along side of the major channel is a smaller tributary channel.

This image from NASAs Mars Odyssey shows two craters located on the margin of Syrtis Major Planum.

This image from NASAs Mars Odyssey shows an area near Hooke Crater on the margin of Argyre Planitia.

This image from NASAs Mars Odyssey shows a graben located in Acidalia Planitia.

This image from NASAs Mars Odyssey shows part of the south polar cap. The numerous layers that comprise the polar cap are readily visible.

This image from NASAs Mars Odyssey shows two linear depressions, graben, created by tectonic activity.

This image from NASAs Mars Odyssey shows part of Cerunius Fossae. The linear depressions are fault bounded features called graben.

This image from NASAs Mars Odyssey shows the margin of the Terra Sabaea highlands and the Nilosyrtis Mensae lowlands.

This image from NASAs Mars Odyssey shows part of the summit caldera of Arsia Mons.

This image from NASAs Mars Odyssey shows linear depressions created by tectonic forces. The sides of the depression are faults.

This image from NASAs Mars Odyssey shows part of the south polar cap. The dark bands are troughs.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken at the end of southern summer.

This image from NASAs Mars Odyssey shows part of the surface of the south polar cap. Collected at the end of southern summer, most of the ice is fr...

This image from NASAs Mars Odyssey shows part of the South Pole. The layers that comprise the polar cap are visible along the sides of the chasma.

This image from NASAs Mars Odyssey shows part of the floor of Renaudot Crater, located on the margin between Terra Sabaea and Utopia Planitia.

This image from NASAs Mars Odyssey shows plains and unnamed craters in Terra Sabaea.

This image from NASAs Mars Odyssey shows part of the floor of Herschel Crater.

This image from NASAs Mars Odyssey shows the floor of an unnamed crater in Noachis Terra.

This image from NASAs Mars Odyssey shows part of Mangala Fossa.

This image from NASAs Mars Odyssey shows part of the margin of the north polar cap and the surrounding plains.

This image from NASAs Mars Odyssey shows part of an unnamed crater in Arabia Terra.

This image from NASAs Mars Odyssey shows the margin between the north polar cap and the surrounding plains.

This image from NASAs Mars Odyssey shows Inuvik Crater, located near the north polar cap.

This image from NASAs Mars Odyssey shows part of Firsoff Crater, located north of Meridiani Planum.

This image from NASAs Mars Odyssey shows an unnamed crater in Acidalia Planitia.

This image from NASAs Mars Odyssey shows an unnamed crater north of Meridiani Planum.

This image from NASAs Mars Odyssey shows part of Endeavour Crater in Meridiani Planum.

This image from NASAs Mars Odyssey shows part of Arabia Terra.

This image from NASAs Mars Odyssey shows part of the plains of Noachis Terra southwest of Schiaparelli Crater.

This image from NASAs Mars Odyssey shows part of Terra Cimmeria.

This image from NASAs Mars Odyssey shows part of Herschel Crater located in Terra Cimmeria.

Taken on April 24, 2019, this image shows the Martian moon Phobos, as viewed by NASAs 2001 Mars Odyssey orbiter using its infrared camera, THEMIS.

These three views of the Martian moon Phobos were taken by NASAs 2001 Mars Odyssey orbiter using its infrared camera, THEMIS.

These are two views of the same observation of the Martian moon Phobos taken in both infrared and visible light by NASAs 2001 Mars Odyssey orbiter ...

This movie shows the Martian moon Phobos as viewed in visible light by NASAs 2001 Mars Odyssey orbiter on April 24, 2019.

Each of the three panels is a series of images taken on different dates. Deimos, Mars other moon, can also be seen in the second panel.

This movie shows three views of the Martian moon Phobos as viewed in visible light by NASA's 2001 Mars Odyssey orbiter. The apparent motion is due ...

This movie shows the Martian moon Phobos as viewed in visible light by NASA's 2001 Mars Odyssey orbiter on April 24, 2019. The apparent motion is d...

These are two views of the same observation of the Martian moon Phobos taken in both infrared and visible light by NASA's 2001 Mars Odyssey orbiter...

These three views of the Martian moon Phobos were taken by NASA's 2001 Mars Odyssey orbiter using its infrared camera, THEMIS. Each color represent...

Taken on April 24, 2019, this rainbow-colored image shows the Martian moon Phobos, as viewed by NASA's 2001 Mars Odyssey orbiter using its infrared...

This image from NASAs Mars Odyssey shows part of Noachis Terra. The large craters are unnamed, as is the channel in the center of the image.

This image from NASAs Mars Odyssey shows part of Terra Sabaea.

This image from NASAs Mars Odyssey shows part of Briault Crater located in Tyrrhena Terra.