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We've done a lot in space. It's just that a lot of it isn't as dramatic as landing men on the moon, because technology has advanced to the point that machines can gather and transmit data to earth better and faster than humans can. Think of that Mars rover that may have found evidence of carbon based material, the Hubble telescope which has allowed us to figure out how old the universe really is and has let us see deeper into it than ever before, and the recent discovery of ice on Mercury, in craters so deep and shielded from the sun that water droplets can actually freeze on a planet with a surface temp high enough to melt lead.
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