Learn more: http://www.khanacademy.org/video?v=YYEgq1bweN4
A framework for thinking about how many detectable civilizations are out there.
Channel: Education Channel
Related tags:
Learn more: http://www.khanacademy.org/video?v=YYEgq1bweN4
A framework for thinking about how many detectable civilizations are out there.
Channel: Education Channel
Related tags:
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