Misconceptions About Space, Time & The Universe
Science & Futurism with Isaac Arthur
00:00
The Edge of the Universe
The universe has no edge. What we usually call the edge of the universe is the CMB or Cosmic Microwave Background Radiation. There was a critical point where things expanded and cooled enough that hydrogen shifted to a less absorptive state, and things would just spread out more. If we ever got better at detecting neutrinos, we could probably look all the way back to the first minutes after the Big Bang. But since we cannot, at least with current technology, if we tried to send a signal to that spot, it would never reach it as it is currently traveling away from us at 7 times the speed of light.
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