Several solutions to the Fermi paradox include:
1) The rarity of Earth. Either habitable worlds are very rare,we may be the only civilization
2) A star like the sun is unlikely to produce life, so most civilizations ingnore our star.
3) It's rare for civilizations to survive past a certain technological level
4) Advanced civilizations evolve away from biological level, don't require habitable planets, and so ignore us
5) They have a non-intervention policy, note that this one is very implausible because if a civilization exists, the likelihood that some of its members decide to "break ranks" and make contact, for ill or for good, is overwhelming
6) There's only one advanced civilization in existence and it destroys all other civilizations it encounters. This one is deemed probable by no one other than Stephen Hawking.
If number 6 is true, then basically we're all toast. The only way we could defeat such a civilization is through sheer luck, up to including their architect giving up and saying "I'm tired of winning all the time".
Modifié par tractrpl, 20 avril 2012 - 04:15 .





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