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Why would Martian life be similar to that on Earth? About 4 billion years ago, when terrestrial life probably got its start, rocky bodies were flying through the solar system and slamming into the planets. These impacts threw pieces of the planets into space, and some of these pieces landed on other planets as meteorites. Ancient microbes might have hitched a ride to or from Mars on these meteorites. While in space, the surfaces of these rocks would have been sterilised by UV radiation.......