SMRTR Science & EngineeringJan 27, 2026Nautilus

Why Astronauts Quarantine Before—But Not After—Space Missions

SMRTR summary

Artemis II astronauts are currently quarantining in Houston before their February moon mission, following NASA's standard health protocol used since 1971 to prevent launch delays from illness. Unlike early Apollo missions where astronauts quarantined for three weeks after returning due to fears of lunar contamination, modern crews return home immediately since scientists now know the moon poses no biological threat to Earth.

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