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From these two facts it follows that the evolutionary path to life-forms capable of space colonization leads through a "Great Filter," which can be thought of as a probability barrier.
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Now, just where might this Great Filter be located? There are two possibilities: It might be behind us, somewhere in our distant past. Or it might be ahead of us, somewhere in the decades, centuries, or millennia to come. Let us ponder these possibilities in turn.
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OFCOL Thanks
ToSeek I just wasted 4210 words.
There are more than two possibilities. For instance, the "Great Filter" might be ten gazillion years wide and we might be at any point along it.
PS:
Nick Bostrom's home page "Director of the Future of Humanity Institute at Oxford University. Philosopher, polymath, leading transhumanist thinker and spokesperson."