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The ISS is 'too clean', and it could be making astronauts sick
(www.abc.net.au)
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this post was submitted on 28 Feb 2025
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To be honest: I don't think that's much of a problem (unless...). The pathogens on earth are all adapted to attack (if you want to use this verb on a cellular level) us and others on earth. They would most likely not pose a threat to any other lifeforms that have evolved on other planets, unless our way of evolution is the only one which is able to produce life. And that is a big unless, because apart from the panspermia theory (life came to us with a meteor) there is no reason to assume that life has to work the same way it does for us.
Time travel interactions however, those could be a problem
The main issue to conquer once we are able to go back, is how to go back without dieing or killing off a significant fraction of our ancestors, creating temporal paradox.