Agence France-PresseJanuary 23, 2014 17:37
A strange rock that looks like a jelly doughnut has appeared on Mars, and scientists are closer to figuring out how it got there, a top NASA expert said Thursday.
The small, round object suddenly popped up in pictures taken 12 days apart by the US space agency's decade-old Opportunity rover.
On December 26, 2013, it was not there. On January 8, it was. But what is it?
"It looks like a jelly doughnut, white around the outside, red in the middle," said Steve Squyres, the principal investigator of the Mars Exploration Rovers.