QUOTE(PsychoTemplar @ Jun 8 2005, 10:08 PM)
Read Hitch Hiker's Guide to the Galaxy, the whole book is pretty much based on the idea that it's impossible to actually know what's going on. It's incredibly entertaining.
Science fiction is dubbed as such for a reason. While they are based on science, much are still fiction.
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Chances are, there are an incredible number of planets that can sustain life, and eventually that life would evolve and slowly become intelligent.
For this to happen, many requirements need to be met: source of energy, stable planet able to contain atmosphere, and organic compounds. At least, this is what scientists SAY. Just because these are what happened on Earth does not mean it's the only way, but it's nevertheless very hard to find the right environment for life to have developed.
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But since we have no first hand experience we cannot know if it is possible for intelligent life to escape it's own demise. There are a lot of things that would shorten our life span (as "Earthians") so that we do not invent the technology we need to move on before we die. Those things could be extreme pollution, war (biological poisons especially) and natural disasters like the sun expiring, a giant peice of space junk colliding with the Earth, and a host of things like Ice Ages that eliminated species before us.
Pollution and war result from human expansion and development of new technologies mixed with politics. They need to be sorted out somehow, but that's another topic. The sun expiring will not be for a very long time. Space junk have been colliding with Earth, but even mass extinctions have not killed all organisms. Ice ages are controversial, some say we humans are speeding the process up, others say nature's already doing a good job, but either way it's coming. Technology can help us get through them.
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So the question would be, is it even possible for a species to beat extintion?
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Yes, it's called staying alive and producing viable offsprings. Many modern species that have not changed since ancient times can be considered to have "beat extinction", such as roaches, which have remained mostly unchanged for millions of years.