Japan's priceless asteroid Ryugu sample got 'rapidly colonized' by Earth bacteria Space.comSamples of 'alien' asteroid Ryugu are crawling with life — from Earth Livescience.comRare Asteroid Sample Contaminated by Microorganisms Despite Scientists’ Best Efforts GizmodoRapid Colonization of a Space‐returned Ryugu Sample by Terrestrial Microorganisms Astrobiology NewsBacteria found on a space rock turn out to be Earth-grown Nature.com