Home > Astronomy > Scale of Earth, Sun, Galaxy, and Universe

How many stars and planets are there in the universe?

Answer 1

More billions than astronomers can even guess.

A typical galaxy, such as the one we live in, contains 200–400 billion stars. The known universe has about 300 billion galaxies; the term "known" is important here because the universe may be much larger than we currently think and contain many more galaxies than we can currently detect.

I realize this is a terrible response, but the number of stars in the universe, let alone planets, is truly anyone's guess.

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Answer 2

Layla Anderson

Because of the universe's vastness and the limitations of current technology, the precise count of stars and planets in the universe is unknown. Estimates suggest that there are billions of galaxies, each containing billions of stars. Planets are also numerous, with many stars hosting planetary systems.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.