Location of NASA landing sites on Mars, in comparison with where a theoretical ocean may have once existed
The locations for the ancient ocean are based on current altitudes and do not reflect the actual ancient topography.
Credit: NASA/MAVEN/Lunar and Planetary Institute
The most detailed geologic map of Mars revealed
The U.S. Geological Survey compiled data from four orbiting spacecraft watching over more than 16 years to reveal the materials, events, and processes that made the present day face of Mars.
Want to know what all the colours represent? The official publication can be found here: (Download pdf)
CRISM: Exploring the Geology of Mars
Christina Beck explains how CRISM hyperspectral images from NASA's Mars Reconnaissance Orbiter are used to understand the history and formation of Valles Marineris, one of the largest canyons in the solar system, and how the data is used to unravel the ancient environments of Mars.c.