NASA's Mars Exploration Rover Opportunity was designed to last just 90 days on Mars.
Today, on Jan. 25, it is celebrating
of working on the Red Planet's surface. Though the rover is showing inevitable signs of age,
such as flash memory problems
, it is still taking valuable observations and measurements of the Martian surface.
Here is a
small selection some of the things it has done since landing at Meridiani Planum in 2004.
MORE: Drive With Opportunity on Epic Mars Rover Marathon
Photo: A simulated view of Opportunity overlaid onto an observation of the Martian surface made by the rover.