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Japan's priceless asteroid Ryugu sample got 'rapidly colonized' by Earth bacteria
"The fact that terrestrial microbes are the Earth's best colonizers means we can never completely discount terrestrial contamination."
The samples were collected by the Japan Aerospace Exploration Agency ( JAXA)'s spacecraft Hayabusa2, which launched in December 2014 and rendezvoused with Ryugu in June 2018. They appeared on the rock and spread with time before finally dying off," team leader Matthew Genge of Imperial College London told Space.com. Japan's Hayabusa2 spacecraft captured these images of unusually bright S-type rocks that stand out from the darker material that makes up the bulk of asteroid Ryugu.
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