how many stars are there in the whole universe?

Answer 1

There are more stars in the Milky Way Galaxy (our galaxy) than there are grains of sand on every beach in the United States.

Answer 2

First of all the observable universe is not infinite but is calculated as having a diameter of 156 billion light years. There may or may not be anything beyond what we can observe, but by definition, we will never know that, will we? It may be finlte or it may be infinite, but we will never know that, either. We have no way of telling.

Astronomers from the Australian National University have come up with a best guestimate of 70 sextillion (7 x 10^22) stars in the observable universe. They did this by studying star densities in sample spaces and then working out how many such spaces there are in the observable universe.

Here is an edited version of one article reporting this:

"70 sextillion stars in the 'known' universe!

According to a study by Australian astronomers there are 70 sextillion (70,000,000,000,000,000,000,000 stars in the known universe.

It's also about 10 times as many stars as grains of sand on all the world's beaches and deserts.

The figure was calculated by a team of stargazers based at the Australian National University.

Speaking at the General Assembly of the International Astronomical Union meeting in Sydney, Dr Simon Driver said the number was drawn up based on a survey of one strip of sky, rather than trying to count every individual star.

The team used two of the world's most powerful telescopes, one at the Anglo-Australian Observatory in northern New South Wales state and one in the Canary Islands, to carry out their survey.

Within the strip of sky some 10,000 galaxies were pinpointed and detailed measurements of their brightness taken to calculate how many stars they contained.

That number was then multiplied by the number of similar sized strips needed to cover the entire sky, Driver said, and then multiplied again out to the edge of the visible universe.

He said there were likely many million more stars in the universe but the 70 sextillion figure was the number visible within range of modern telescopes."

Answer 3

Our galaxy has around 200 billion stars (though I've seen people say 100 billion and 400 billion, too). There are galaxies with more stars, there are galaxies with less. I don't think anyone knows how many galaxies there are, but there are at least as many galaxies in our universe as there are stars in our galaxy.

Answer 4

very rough estimate is 100 billion stars per galaxy, and about 100 billion galaxies (though there may be a good deal more), which gives you 10'000 billion billion stars total, i.e. 10 to the power of 22.

Answer 5

no one knows , becuase the universe keeps expanding, there is about a billon or trillon stars in a galaxy.but just imagine how many galaxies there are. thats alot of stars!

Answer 6

the answer to this question has not yet been discovered by man
however it is probably less that "Graham's Number", the upper bound of a mathematical problem over 20 years old and still unsolved, the lower bound is 6, and may be changed to 11

Answer 7

The important question is how many stars are in your eyes?


The answer is zero.

Answer 8

Too many to count.


A quick calculation says there are atleast 50,000,000,000,000,000 stars in the observable universe.

Possibly many more.

Answer 9

dude this is past impossible to answer! if the universe is expanding every second then billions of stars are being created every second!

Answer 10

there are unlimited and its hard to count. Some stars explode and form new things like stars and galaxies