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How many stars are in the sky

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There are around 6,000 stars visible to the unaided eye on a clear night.

If you wanted to know how many stars are in the universe... let's just say, there are more stars than grains of sand on Earth. A conservative estimate suggests 100 billion galaxies * 100 billion stars per galaxy = 10,000,000,000,000,000,000,000 (10 sextillion) stars.

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That's about as close to infinite as possible!
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Not really. That's only to 10^21. Scientists deal with numbers to far greater powers.
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6000 if you have perfect vision. Most people can see 2,500-3,000.
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Very true, thanks for adding.
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The world may never know.

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This counts as infinite, I think?
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If the theory that the universe is "infinite" is true then there are an infinite number of stars. One theory also states that if you keep going in one direction eventually you will just turn up right where you started. If this is true then there is a limit to how many stars there are. But I don't think anyone will ever know exactly.

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