Re: >It did NOT evolve on planet earth.
(post posting edit: near simultaneous posting to the other response but looking at it, Allan Dyer explained it better)
Alternative line of enquiry.
the bacteria that resistant to hard radiation are resistant due to a evolutionary development to a non-radiation challenge but that is a mechanism that is also radiation resistant.
Low quality analogy - a tank offers protection from x-rays to it's occupants but it's x-ray resistance is a result of defence against pointy metal objects not alien tripods and their terrifying 'heat rays'
Biting the hand that feeds IT
