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Even within present life forms on Earth, there are many which are physically much more resilient and suitable for longer space trips than humans - and probably much more physically adaptable on arriving at a new planet.
The ability to hibernate, remain dormant as eggs, resist radiations, resist high G forces, tolerate changes in air pressure, oxygen starvation, temperature etc - all come to mind.
Permalink Wed, 22 Feb 2012 23:22:14 UTC | #920857