A Martian colony would be too hazardous a place for children, warns Bas Lansdorp, the leader of an effort to establish a colony on the Red Planet in 2023. It's not clear if pregnancy would be possible on the planet or what effect high radiation levels would have on an unborn child, scientists say. "We are not in the business of telling people what to do, but astronauts are very responsible people. When they realize they are living in a dangerous place, they will know what to do, that it's not right," said Lansdorp, co-founder and CEO of the Netherlands-based nonprofit Mars One.

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