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- Horizon problem in inflation and sources

It says that since there is homogeneity in the Universe's temperature, all these points must have come from one source (or a source close to each other?) at a certain time.

Then it also calculates the number of these sources and it's ~10

So is the Horizon problem the fact that we get 10

Then it also calculates the number of these sources and it's ~10

^{5}. But isn't that very dense mass right before the Big Bang considered to be just one source?So is the Horizon problem the fact that we get 10

^{5}different sources, while we should take only one? Or am I getting something wrong here?