Horizon problem

The horizon problem (also known as the homogeneity problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. It arises due to the difficulty in explaining the observed homogeneity of causally disconnected regions of space in the absence of a mechanism that sets the same initial conditions everywhere. It was first pointed out by Wolfgang Rindler in 1956.

This article is about the astronomical "horizon problem". For the problem relating to artificial intelligence, see Horizon effect.

The most commonly accepted solution is cosmic inflation. Different solutions propose a cyclic universe or a variable speed of light.

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