What Has NASA Learned About Mars..??
NASA has used both spacecraft and robots to learn more about Mars. In 1965, Mariner 4 was the first NASA spacecraft to get a close look at the planet. In 1976, Viking 1 and Viking 2 were the first NASA spacecraft to land on Mars. They took pictures and explored the planetís surface. Since then, more spacecraft have flown near or landed on Mars.
NASA's Spirit and Opportunity rovers landed on Mars in January 2004. They found evidence that water once flowed on Mars. Living things need water to survive. So, any sign of water on Mars would mean that there could be, or could have been, life on the planet.
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