Mysterious rock appears near Mars rover Opportunity Just showed up-pics at link.

[link to rt.com]
An odd-looking bit of rock mysteriously appeared in front of Opportunity rover in the beginning of January as the rover, waiting out the Martian winter, has not moved since the end of November, according to NASA.

The rock suddenly appeared on photographs taken by Opportunity Mars rover on Sol (Martian day) 3540 or January 8 Earth time, according to NASA’s website.