Quote (WidowMaKer_MK @ Aug 5 2011 09:02am)
...the only obvious thing is that having to go into space to survive as a species is a science fiction pipe dream .
You clearly know nothing about cosmology, but since I'm not like you I won't withhold information that I claim to have. Instead I'll demonstrate that I'll actually have it.
The sun won't last forever. In a few billion years it will finish burning through its hydrogen supply and start helium fusion at its core. When that happens, the expanding forces will become greater than the gravitational forces causing the sun to swell up and engulf much of the inner solar system. The sun will become a Red Giant and the Earth will be gone. If we're not on other planets by the time that happens, our species is gone.
And that's assuming we don't have an ELE (extinction level event) from a large asteroid or have our climate patterns dramatically altered in the mean time.
So yes, we will need to leave sooner or later. The Earth isn't going to be our home forever.