The Great Filter is a single improbable step that blocks every civilization's progression from dead matter to galaxy-colonizing civilization, and the critical question is whether this filter lies behind us (meaning we were lucky to survive it) or ahead of us (meaning we face an imminent catastrophe).
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Robin Hanson's Great Filter: The Most Terrifying Idea in AstrophysicsAdded:
Robin Hanson ran the numbers in 1998.
>> [music] >> One improbable step blocks every civilization.
>> [music] >> He called it the great filter.
The question is the filter behind us or ahead?
>> [music] >> Behind us means we were lucky. Ahead means catastrophe.
New data suggests [music] ahead. Case file linked in the description.
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