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www.space.com/26078-how-many-stars-are-there.html

Thanks to missions like these, we are one step closer to providing a more reliable estimate to that question asked so often: 'How many stars are there in the universe?'" Observable universe

www.universetoday.com/102630

When we look at the night sky, filled with stars, it’s hard to resist counting. Just with the unaided eye, in dark skies, you can see a few thousand. How many stars are there in the entire Universe?

www.livescience.com/56634-how-many-stars-are-in-the...

Though humans have named a few constellations of stars, from Orion to the Big Dipper, in reality, there are many more stars in the universe than could ever be given names.

en.wikipedia.org/wiki/Observable_universe

There are at least 2 trillion galaxies in the observable universe. Assuming the Universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe has a spherical volume (a ball) centered on the observer.

www.skyandtelescope.com/.../how-many-stars-are-there

When asking the question "How many stars are there in the universe?" it's important to distinguish between the universe as a whole and the observable universe. Because the universe was born 13.8 ...

www.esa.int/.../Herschel/How_many_stars_are_there_in_the_Universe

Knowing how fast stars form can bring more certainty to calculations. Herschel has also charted the formation rate of stars throughout cosmic history. If you can estimate the rate at which stars have formed, you will be able to estimate how many stars there are in the Universe today.

www.reference.com/science/many-stars-universe-e4126345df8632a0

Another factor that contributes to the number of stars in the universe is that stars are born and die every day. Again, the rate at which stars die and form varies. Space observatories around the world are able to chart the rates of star development throughout history to estimate the number of stars in the universe on any given day.