a device sent to mars, which will look at rocks and transmit data to earth, looking for signs of water. however, due to lack of planning, the mars rover is regrettably not waterproof.
Spacecraft sent to Mars that land and have the ability to move from their original site. Currently referring to Spirit and Opportunity, which were launched in 2003. Part of an ongoing program began in the mid 1990's that is currently planned out to around 2009.
May also refer to Pathfinder or Beagle 2.
"The Mars rovers are completely friggin justified, cost less than a few bombs, could possibly give hints to whether or not there is life elsewhere in the universe, and Bush didn't send them, idiots."
The mars rover's lineage can be traced back to Earthling settlers on the planet Mars, who allowed their pet 'dogs' to cross-breed with the local wild-life. This eventually became known as the mars rover.