Mysterious rock just appeared in front of Opportunity

Astronomers at the Jet Propulsion Laboratory in California, baffled after a rock suddenly appears out of nowhere in front of Opportunity rover on Mars.    Image © NASA/JPL-Caltech

Photo taken on Jan 8th (Sol 3540) shows a rock that wasn’t there in previous images (Sol 3536). Opportunity rover hasn’t moved in over a month as it awaits better weather.

According to one theory, the rock was stuck in the rover’s wheels and fell to its current position.

Another theory claims that may be a Martian rock that was blown out of the ground by a meteoroid impact.

via discovery