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Robots on Mars
Mars rovers are car-sized robots that drive across the surface of Mars, taking photos, drilling rocks, and analyzing soil. NASA has sent five rovers to Mars: Sojourner (1997), Spirit (2004), Opportunity (2004), Curiosity (2012), and Perseverance (2021). Each rover is more advanced than the last. It takes about 7 months to fly to Mars and about 12 minutes for radio signals to travel between Mars and Earth!