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by gus_massa 4504 days ago
The surface of Mars is approximately equal to the land surface of Earth. It’s big.

http://www.msl-chemcam.com/index.php?menu=inc&page_consult=t... - Mars 101#.UvuUrHbfMdc

We have there only ¿three? moving robots there, but IIRC one is not moving and one is not working. And there are some (maybe 10) full static platforms, but I don’t know if any of them is working now.
1 comments
cecilpl 4504 days ago
There are four rovers that have successfully moved around.

Sojourner stopped working in 1997, Spirit stopped working in 2010, and both Opportunity and Curiosity are still moving around.

link