A NASA image of Mars being passed around on social media over the weekend has imaginations running wild.
The photo shows a stone formation in front of what may be a kind of cave. Some say it looks a bit like a crab monster straight out of a science fiction tale.
Here's a closer look:
There may be no evidence for life on Mars -- yet -- but you can do more than scan images to help the hunt for extraterrestrial intelligence. UC Berkeley's SETI@Home allows you to put your computer's spare processing power to work analyzing narrow-bandwidth radio signals from space.
