There is no place you can go on Earth that hasn't been colonized by bacteria, from the bottom of the oceans to the cloud tops. And when Japanese researchers examined samples of Asteroid Ryugu from the Hayabusa2 mission, they realized the little devils had found a new home. Despite containment protocols, with the samples delivered in a hermetically sealed chamber, opened in airtight containers in nitrogen gas, in a negative pressure room, life found a way.


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Source: Asteroid Samples Returned to Earth Were Immediately Colonized by Bacteria