Ok so I saw the dead astronauts on moon and then it brought me back to oxygen, bacteria can not survive in space , so your body can not decay , so how are the astronauts skeletons?
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There are bacteria that survive space. And there's no telling what crap the Hive brought with them when they took over the Moon. Or what they did to the colonists on the moon. Plus there is some type of atmosphere on the moon. It was habitable by humans at some point after the traveller showed up.