I recently read that there are a billion trillion stars in the known universe. How many zeros is that?
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answers:
Ronald 7 say: How many hairs does a horse have ?
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oldprof say: 21
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az_lender say: 9 + 12 = 21
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Jeffrey K say: 10^9 * 10^12 = 10^21
That is 21 zeros. But most estimates of the number of stars is greater than that.
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Bulldog redux say: That would be 10^21.
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