I watched Apollo 13 the other night. Weird as it is, I actually get a little teary eyed at the launch scene and find myself rooting for the rocket to make it into space. The space program really was an amazing propaganda machine for both the United States and the USSR.
Then I got to thinking about how now we no longer have a vehicle to take Americans into space and that we're relying on Russia's Soyuz spacecraft. Almost made me think we should fund NASA more.
And then I read this. Nevermind.
To the extent that I think about such things, my belief is that if aliens do exist, they don't have the technology to get here. If we were reached by anything at all, it would be by a machine. And really, there's no real purpose in visiting Earth unless you are interested in extraterrestrial (by their definition) life as we are. I highly doubt the Earth has much raw materials worth colonizing us for at such distances.