/u/ecky--ptang-zooboing's posts
The photons sent after the big bang must have bumped into millions of galaxies, stars, planets, ... If matter absorbs photons, how is it possible that we still see the cosmic background radiation?
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When the topic of our existence comes up in conversation, I always say that humans exist only for about 200.000 years. How is this determined? What drew the line between humans and whatever it was called before that?
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