Curiosity rover: 2 years on the roll

Wheel tracks from the Mars rover Curiosity are seen on the sandy floor of a lowland area dubbed “Hidden Valley” in this image taken Monday, August 4. The rover has now spent two years on the red planet. Curiosity set off from Earth in November 2011 and landed nearly nine months later — 99 million miles away. Click through to see more of its images.

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