Tee-hee-hee! Tch, I watch alotta docs 'bout astronomy, tch, so I'm joinin'! ^_^ My favourite constellation ish Draco! ^^
Extra solar planets? Hmm, tch, I'd say a few billions of billions... out of which... I dunno how many would have life on 'em... I'd say about 10 or so.
Appropriate conditions for life are so very few out there, most planets being extreme, tch, plus tha chances of complex chemical reactions like life have a very slim chance of happening, let alone bein' lucky enough ta survive, like ours has so far...
Settling ppl on tha moon? Well it's got alot of Helium 3 that can be extracted an' used as fuel ta visit other stars, tch, like Alpha Centauri, but meh, tch, space programs're always changing. Who knows what other means of transport they'll think of by tha time they actually make a base there. I say they should go for nuclear propulsion...
Personally, when I think about astronomy at an even broader scale it's kinda discouraging. The Universe will die out, our galaxy is slowly being eaten by black holes, distances between stars are so great... but I'm still hoping that man will overcome all these problems. ^^;;