But the NASA rovers, Spirit and Opportunity, are the closest things we have to the space robots of science fiction.

VOA: special.2010.07.28

Another robot is designed to move and turn in a way that is similar to the Mars rovers.

VOA: special.2010.07.28

Mars landers and rovers were designed to look for signs of liquid water that may have flowed on Mars in the distant past.

VOA: special.2010.07.28

Orbiters,landers and rovers have all been used to explore Mars.

VOA: special.2010.07.28

Curiosity is much heavier than older rovers called Spirit,Opportunity,and Sojourner.

VOA: special.2011.04.26

The rovers were launched in two thousand three.

VOA: special.2010.07.28