This is not an easy question. The way to determine the number of stars in the sky or universe is to consider how many stars there are in the Milky Way, and then to multiply that number by the best guesstimate at the number of galaxies in the universe. According to this procedure, there are probably about 400 billion stars in the Milky Way.

NASA says that there are zillions of uncountable stars. A zillion is any uncountable amount. On the other hand, other star enumerators say that there might be around 3 thousand million billion stars, this means:
30, 000, 000, 000, 000, 000 stars.

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