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Photos: Mars rover Curiosity

The Mars rover Curiosity does a test drill on a rock dubbed "Bonanza King" to see if it would be a good place to dig deeper and take a sample. But after the rock shifted, the test was stopped. The NASA 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.

The Mars rover Curiosity does a test drill on a rock dubbed "Bonanza King" to see if it would be a good place to dig deeper and take a sample. But after the rock shifted, the test was stopped. The NASA 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.