<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.

Photograph by NASA/JPL-Caltech

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.

Follow Michael Greshko on Twitter.

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