Quote:
Originally Posted by photon
I totally agree, it's likely there's other life out there.. though maybe not in our galaxy, since on a galactic time scale anyone that got to the point of colonizing the galaxy (which is pretty much inevitable unless you destroy yourself) should have left behind a lot of evidence of it.
(For aside reading on that, check out the Fermi Paradox: http://en.wikipedia.org/wiki/Fermi_paradox)
But there's nothing to show they're visiting earth secretly out side of blurry videos, crop circles made by mischievous people, and hypnotically suggested memories. 
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I like the Drake Equation, but you can go anywhere from 100 to a bajillion civilizations.
http://en.wikipedia.org/wiki/Drake_equation
I beleieve there is life in this galaxy. Infact, there could be life in this solar system that we could find very soon. That would be beneath the icy surface of Europa, a moon of Jupiter. but of course, that wouldn't be intelligent life in the way we're talking about. No Europans are going to fly saucers to earth anytime soon.
I think our own galaxy is 100,000 light years across and consists of 400 billion stars. If there's not an intelligent civilization orbiting one of those 400 billion stars, i'd be suprised. And how many billions of galaxies are there? The odds are just too great for there not to be life.
All you need is a rock in a habitable zone orbit which makes for liquid water. Thats the basis for life right there.