There are about 1,000,000,000,000,000,000,000 stars in space, or about 10 raised to the 21 (10 ²¹ power, roughly.

This amount is about equal to the number of grains of sand on ALL of the beaches on planet Earth!!! That is a lot!!

This is a fantastic question, and one that is difficult to answer! I did some research on the NASA website
stars, click here and found some fascinating information! Our galaxy, the Milky Way, has approximately 100 billion stars in it, but the Milky Way is not the only galaxy in the universe…

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!

Notice that I have been saying the observable universe. We can only observe parts of the universe that are within 13.7 billion light-years of Earth. This is because the big bang occurred about 13.7 billion years ago. We make observations about distant stars by measuring the light that reaches Earth and satellites that we have in space. Light from stars farther than 13.7 billion light-years away has not had time to reach us yet! The universe must be much bigger than the universe that we can observe at this time, therefore there may be many more stars out there!

The number is probably infinite, but we can't see them all because light travels at a finite speed, and light has had only about 13.7 billion years to travel. This means that we cannot see any stars farther than about 13.7 billion light years away.

Within 13.7 billion light years, we can see roughly 50 billion galaxies, each of which is composed of somewhere around 100 billion stars.

I think the estimate is about 9*10² stars (a 9 followed by 21 zeros!).

Scientists estimate that there are about 1 000 000 000 000 stars in the Milky Way galaxy, which is one of ~1 000 000 000 000 galaxies. Although these are rough estimates, using these numbers we might imagine there are...a lot...of stars. The number is so large we usually write it in a special way. The number is 1 000 000 000 000 000 000 000 000, which has 24 zeros, so we write it as 10²⁴.