There are ten trillion or 1.0x10^13 galaxies in the universe. To estimate how many stars are in the universe we can multiply 1.0x10^11 by 1.0x10^13. Using the
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, we just add the exponents. So 11 + 13 = 24. The universe has about 1.0x10^24 stars. That's 1,000,000,000,000,000,000,000,000 stars!