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Water-carved valleys on Mars appear to have been caused by runoff from precipitation, likely meltwater from snow. Early Martian precipitation would have fallen on mountainsides and crater rims.

Today the planet Mars is directly opposite the Sun, as Earth lines up exactly between both objects. Mars is currently retrograding in apparent sky motion relative to background stars, as Earth catches...

Long ago, in the largest canyon system in our solar system, vibrations from "marsquakes" shook soft sediments that had accumulated in Martian lakes. The shaken sediments formed features that now appear as a series of low hills apparent in a geological map based on new NASA images. Enhanced color image of the Candor Colles region of Candor Chasma, Mars. Image is 1 km (0.62 miles) across. (USGS Astrogeology Science Center, Flagstaff, Arizona)

The tenuous atmosphere of Mars visible on the horizon. By NASA - http://solarsystem.nasa.gov/multimedia/gallery/Mars__atmosphere.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=38129406

X-ray Image of Venus - This first-ever X-ray image was made with data from the Chandra X-ray Telescope