<p>After trekking up a steep ridge, NASA's Opportunity rover stopped to look back at its tracks on March 31. To scientists' surprise, the rover's camera caught a Martian dust devil twisting through the valley below.</p>
Extraterrestrial Twister
After trekking up a steep ridge, NASA's Opportunity rover stopped to look back at its tracks on March 31. To scientists' surprise, the rover's camera caught a Martian dust devil twisting through the valley below.
- Week's Best Space Pictures
Week's Best Space Pictures: Mars Rover Spots Dust Devil
NASA's Opportunity rover captured the incredible picture by chance after clambering up a steep ridge.
Feed your need for heavenly views of the universe with our pick of the most awe-inspiring space pictures.
This week, astronomers find a big black hole in a strange location, Hubble reveals a hard-to-spot galaxy, and Mars shows off scars made by an ancient river system.
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