Really. Where are all the aliens? We should have been probed, exterminated, assimilated, infected, invaded or abducted by now, shouldn't we?
The Fermi Paradox ponders the lack of evidence of another transmitting intelligent civilization -- of all the stars and all the galaxies in the universe, you'd think one intelligent alien race would have bothered to call by now? Either we're on the interstellar "do not call" list, or we're the most advanced life form out here (scary thought), or (even scarier) we're the only life form out here.
The search for any extraterrestrial life is one of the most profound things we, as a species, can do. But as any other life beyond Earth's shores has yet to be discovered, the search for extraterrestrial intelligence (SETI) can be a hard-sell. Still, the search continues and scientists are thinking up more and more extreme ways to fine-tune our high-tech array of astronomical instruments to detect intelligence in the stars.
Here are the weird and wonderful ways scientists hope to snare an intelligent alien.