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The very fact that Earth is inhabited by humans, not some alien colonizers that settled a billion years ago, could mean a few possibilities:

-We ARE, in fact, alone

-It is impossible to circumvent, in any way, the limitation of light speed

-Life capable of traveling from their own planet is exceedingly rare

-Earth an alien experiment, or a sort of 'wildlife preserve' protected by alien powers (as in the nifty freeware game, Transcendence)

A Star Trek/Wars type of universe with an abundance of alien species is extremely unlikely.  I hope it is just that intelligent life is very, very rare and not that we're permanently stuck here in this solar system.