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It isn't really known how large the Universe is. In the so-called "observable Universe", as a rough estimate, there are 10 to the power 11 galaxies, each of which on average has about 10 to the power 11 stars, so that gives you 10 to the power 22 stars.Light from anything outside the "observable Universe" can never reach us; anyway, it is estimated that the Universe is thousands of times larger than the observable part; it may be infinite in size, but that is not currently known for sure.

(Update: 10 to the power 22 means a 1, followed by 22 zeros.)

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9y ago

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