This image released by NASA on May 20, 2013, shows a hole in a Martian rock drilled by the NASA rover Curiosity on the previous day.
This undated image provided by NASA shows powdered rock in the scoop of the Mars rover Curiosity.
This image provided by NASA shows the Curiosity rover's three left wheels.
A Martian rock outcrop near the landing site of the rover Curiosity, believed to be the site of an ancient streambed. Next image shows similar rocks found on earth.
The work site of the NASA’s rover Curiosity on Mars.
A rock outcrop in Gale Crater on Mars.
The edge of NASA's Curiosity rover, showing the shadow of the rover's now-upright mast in the centre, and the arm's shadow at left.
The Curiosity rover's wheel tracks on the surface of Mars on Aug. 22, 2012. The picture was taken by one of the rover's cameras.
This artist's rendering provided by NASA shows the Curiosity rover on the surface of Mars.
A self-portrait taken by the NASA rover Curiosity in Gale Crater on Mars.