Mars colonists who alter their bodies may day evolve into a new species
Nasa plans to put humans on Mars by 2030 and has already begun to test the limits of its astronauts.
But we may have to take more drastic steps - including modifications to the body and mind - if we are ever to succeed in visiting our inhospitable neighbour.
And once we arrive on the red planet, its unique environment could force rapid evolutionary changes creating a whole new species, experts claim.
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