There are about 10 billion galaxies in the observable universe! The number of stars in a galaxy varies, but assuming an average of?100 billion stars?per galaxy means that there are about 1,000,000,000,000,000,000,000 (that's 1 billion trillion) stars in the observable universe!
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Averaging out the types of stars within our galaxy, this would produce an answer of about?100 billion stars?in the galaxy. This is subject to change, however, depending on how many stars are bigger and smaller than our own sun. Also, other estimates say the Milky Way could have 200 billion stars or more.
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