One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe. Assuming that the number of stars in the Milky Way is the average number, how many stars are in the universe?
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Universe has 1010 galaxies and each galaxy has 1010 stars then :-
universe has 1010x1010 = 1020100 stars
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