It probably came from Earth.

It probably came from Earth. We should probably seriously consider raising the altitude of what we consider to be the biosphere.

https://www.google.com/amp/s/www.rt.com/document/5a1bae91fc7e93e7668b4567/amp/411039-living-bacteria-iss-surface#ampshare=https://www.rt.com/news/411039-living-bacteria-iss-surface/

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