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

Is there an estimation of how many stars there are in this known universe?

Answer 1

Yes, but it is very rough so far as I know.

An estimated 100 billion galaxies are thought to exist, and I mean it when I say that each one contains several hundred billion stars on average.

This gives us #n = 1 xx 10^11 xx 1 xx 10^11 ~~ 1 xx 10^22# stars.

As I mentioned before, it's a little hazy, but it's safe to say that it's a huge number (it's about a mole of stars, which is irrelevant but makes you think...)

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Lydia Allen

Estimates suggest there are between 100 billion to 200 billion galaxies in the observable universe, with each galaxy containing hundreds of billions of stars. This means there are roughly 10^24 stars in the observable universe.

By signing up, you agree to our Terms of Service and Privacy Policy

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.