Scientist Enrico Fermi speculated in the 1960’s that if alien intelligence was as common as their calculations suggested, then the aliens really should be here already. There are so many stars out there (some 100,000,000,000 in our galaxy alone, one of as many galaxies) that it seems almost inconceivable that we should be alone.
The space telescope Kepler is finding lots of planets too. So… Where are the aliens? I have revised my Area 51 web page to take the new figures into account and made some guesses as to what the new numbers should be, and it doesn’t look good. I come to the conclusion that we can expect only one contactable civilization per 200,000 galaxies. Read that page and the Area 52 page for the full details. :'(