Mystery on Mars: Rock suddenly appears in front of Opportunity rover leaving scientists baffled

Mystery on Mars: Rock suddenly appears in front of Opportunity rover leaving scientists baffled | Mail Online: "An strange rock, seen here on the left image, mysteriously appeared in front of Opportunity rover in the beginning of the month. The rover, which landed on Mars in 2004, hasn't moved in over a month as it waits for better weather on the red planet"