4 years ago
Colonizing Mars may require humanity to tweak its DNA
If humanity is ever going to settle down on Mars, we may need to become a little less human. Crewed missions to Mars, which NASA wants to start flying in the 2030s, will be tough on astronauts, exposing them to high radiation loads, bone-wasting microgravity and other hazards for several years at a time. But these pioneers should still be able to make it back to Earth in relatively good nick, agency officials have said.
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