What does a mars rover do?

NASA's Mars Exploration Rover (MER) mission is an ongoing robotic space mission involving two Mars rovers, Spirit and Opportunity, exploring the planet Mars. read more

NASA's Mars rover Curiosity will assess the ability of the Red Planet to sustain microbial life. Here's a look at the 10 science instruments that will help it do the job. read more

The big science question for the Mars Exploration Rovers is how past water activity on Mars has influenced the red planet's environment over time. While there is no liquid water on the surface of Mars today, the record of past water activity on Mars can be found in the rocks, minerals, and geologic landforms, particularly in those that can only form in the presence of water. read more