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Here's the horizon problem: Look at the sky. Look at one side of the sky. Then look at the other side of the sky. The light from one side has just now reached you, as has the light from the other side. When we look back to the earliest observable moments of the universe, the Cosmic Microwave Background (CMB), we do the same thing. We look at light that was ...


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The assumption has 2 problems with it. 1) the universe is expanding, so it's larger than what we observe and the rate of that expansion isn't exactly known. 2) we don't know how old the universe is exactly (They have a pretty darn good estimate, but it's still an estimate) and 3) due to gravity and time dilation, the observable universe isn't a perfect ...



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