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by _likeariot
104. Multiplying the number of galaxies - which is about 2 trillion - by the 100 million stars in the galaxy suggests there could be about 10 raised to the 20th power stars in the universe. But this could easily be a factor of 10 higher.
2,000,000,000,000 x 100,000,000 = 2e+20 (or) 200,000,000,000,000,000,000
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