A dance-step pattern is visible in the wheel tracks near the left edge of this scene recorded by the navigation camera on NASA's Mars Exploration Rover Opportunity during the 2554th Martian day, or sol, of the rover's work on Mars (April 1, 2011).

ESA's Mars Express satellite orbiting Mars has documented deep fractures in the surface of Mars. The huge canyons were robably caused by surface-tensions, when a very large impact crater flooded with lava cooled of

The MRO Mars-Orbiter has discovered the total amount of atmosphere on Mars changes dramatically as the tilt of the planet's axis varies. This process can affect the stability of liquid water, if it exists on the Martian surface, and increase the frequency and severity of Martian dust storms.

Bombardments of 'micro-meteorites' on Earth and Mars four billion years ago may have caused the planets' climates to cool dramatically, hampering their ability to support life, according to new research.