4 rovers :-
Sojourner
Opportunity
Spirit
Curiosity.
There have been seven attempts at sending rovers to Mars of which four landed successfully.
So far, Nasa has successfully acquired four Mars rovers: the Mars Pathfinder, Sojourner, Opportunity, and the Spirit. These were managed by the Jet Propulsion Laboratory and the Mars Science Laboratory.
the rusians have only a 2% success rate of landing rovers on mars and the united states has a 66.6%(2 landed out of 3)success rate
"Spirit" and "Opportunity". Those two were sent in January, year of 2004. Before that a small one called "Sojourner". And now "Curiosity", of course. So that's 4 altogether. That's not counting those that failed.
As of November 2016 there are two operational Mars rovers: Opportunity and Curiosity.
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There are two Mars rovers, named Spirit and Opportunity. There's obviously "Curiosity" now too. In fact Spirit doesn't work anymore, so there are still two Mars rovers working.
THEY WERE SENT TO MARS SO THAT WE CAN DISCOVER MANY NEW THINGS ON MARS!!!
six of the Apollo missions successfully landed on the moon
Yes, we have sent many probes and some rovers to Mars.
3 were made but only on made it thre
4 - Pathfinder, Spirit, Opportunity, Curiosity