The mysteries of the astronaut biome
Briefly

Space poses some massive dangers for humans, from black holes to the heat death of the universe.But as humanity considers long-haul space travel, there are other, smaller potential hazards that some researchers say may deserve more attention: microbes from Earth.Astronauts face numerous known health problems in space, including a loss in bone density, muscle atrophy, and psychological issues.
Read at Ars Technica
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