I went ahead and merged the two alien topics because they're so very similar. So... talk about aliens!

As for me, I figure it's only logical that life exists outside of our planet. It's almost arrogant to think we're the only ones when you consider the odds. Now... whether or not that life has the technology to physically come to Earth is another matter completely. But I don't think it's unreasonable to think that we've received signals from many years ago that happen to be passing by.

I'm no expert, though. Anyway, just wanted to explain my merging thing.