This image from NASAs Mars Odyssey shows part of the floor of Lyot Crater, including a large field of sand dunes on the crater floor.

This image from NASAs Mars Odyssey shows a portion of Shalbatana Vallis.

This image from NASAs Mars Odyssey shows a portion of Ismeniae Fossae.

This image from NASAs Mars Odyssey shows a section of Cerberus Fossae.

This image from NASAs Mars Odyssey shows a region of wind etched materials near the margin of Lucus Planum.

This image from NASAs Mars Odyssey shows Olympica Fossae, a complex channel located on the volcanic plains between Alba Mons and Olympus Mons.

This image from NASAs Mars Odyssey shows Candor Chasma, one of the largest canyons that make up Valles Marineris.

This image from NASAs Mars Odyssey shows a small section of Shalbatana Vallis.

This image from NASAs Mars Odyssey shows an unnamed crater in Utopia Planitia, with an indentation in the crater rim at the middle of the crater.

This image from NASAs Mars Odyssey shows a section of Bahram Vallis.

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

This image from NASAs Mars Odyssey shows a section of Naktong Vallis.

This image from NASAs Mars Odyssey shows an unnamed crater in Tartarus Colles.

This image from NASAs Mars Odyssey shows a portion of Tantalus Fossae.

This image from NASAs Mars Odyssey shows the boundary between Elysium Planitia and Terra Cimmeria.

This image from NASAs Mars Odyssey shows a small portion of Tempe Fossae.

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

This image from NASAs Mars Odyssey shows the Jezero Crater delta deposit.

This image from NASAs Mars Odyssey shows linear features which are tectonic graben.

This image from NASAs Mars Odyssey shows an unusual channel feature, located south of Tooting Crater near Lycus Sulci.

This image from NASAs Mars Odyssey shows a linear feature, part of Labeatis Fossae.

This image from NASAs Mars Odyssey shows linear depressions, part of Nili Fossae.

This image from NASAs Mars Odyssey shows a section of the many channel forms found radial to the Elysium Mons volcanic complex.

This unusual view of the horizon of Mars was captured by NASAs Odyssey orbiter using its THEMIS camera, in an operation that took engineers three m...

This unusual view of the horizon of Mars was captured by NASA’s Odyssey orbiter using its THEMIS camera, in an operation that took engineers ...

This image from NASAs Mars Odyssey shows linear depressions, part of Idaeus Fossae.

This image from NASAs Mars Odyssey shows part of Hephaestus Fossae. Hephaestus Fossae is a complex channel system in Utopia Planitia near Elysium M...

This image from NASAs Mars Odyssey shows linear features called Oti Fossae. Oti Fossae is located on the eastern flank of Arsia Mons and aligns wit...

This image from NASAs Mars Odyssey shows a section of one of the many channel forms found radial to the Elysium Mons volcanic complex.

This image from NASAs Mars Odyssey shows the upper flank of Olympus Mons.

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

This image from NASAs Mars Odyssey shows part of Indus Vallis, located in northern Terra Sabaea. The channel system is over 300 km (186 miles) long.

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 cross section of the eastern flank of Ascraeus Mons.

This image from NASAs Mars Odyssey shows a portion of Shalbatana Vallis.

This image from NASAs Mars Odyssey shows dark streaks marking the inner rim of this unnamed crater in Terra Sabaea.

This image from NASAs Mars Odyssey shows the ridge forms that are typical of Lycus Sulci, a low lying area of ridges and valleys found to the north...

This image from NASAs Mars Odyssey shows part of Tractus Catena, just one of many north/south trending tectonic graben located south and east of Al...

This image from NASAs Mars Odyssey shows a cross section of Pavonis Mons. Pavonis Mons is the central volcano of the three large Tharsis volcanoes.

This image from NASAs Mars Odyssey shows linear features called Mareotis Fossae. They are part of a huge region of graben that comprise Tempe Terra.

This image from NASAs Mars Odyssey shows a section of Bahram Vallis. This channel is located in northern Lunae Planum, south of Kasei Valles.

This image from NASAs Mars Odyssey shows a section of Scamander Vallis. Scamander Vallis is located in northern Terra Sabaea. The channel is 269km ...

This image from NASAs Mars Odyssey shows Alba Fossae, a set of long valleys on the western side of Alba Mons.

This image from NASAs Mars Odyssey shows part of Granicus Valles. Granicus Valles is a complex channel system located west of Elysium Mons.

This image from NASAs Mars Odyssey shows the ridge forms that are typical of Lycus Sulci, a low lying area of ridges and valleys found to the north...

This image from NASAs Mars Odyssey shows Olympica Fossae, a complex channel located on the volcanic plains between Alba Mons and Olympus Mons.

This image from NASAs Mars Odyssey shows a cross section of Pavonis Mons. Pavonis Mons is the central volcano of the three large Tharsis volcanoes.

This image from NASAs Mars Odyssey shows a section of Bahram Vallis. This channel is located in northern Lunae Planum, south of Kasei Valles.

This image from NASAs Mars Odyssey shows part of Aeolis Planum. The surface in this region has been heavily eroded by wind action.

This image from NASAs Mars Odyssey shows a region of wind etched materials. In regions of poorly cemented surface materials it is possible to creat...