2007-01-15 10:22:09 · 18 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
It is estimated that there can be up to 500 billion galaxies. The Milky Way galaxy itself has from 200 billion to 400 billion stars.
2007-01-15 10:29:51 · answer #1 · answered by Barkley Hound 7 · 0⤊ 0⤋
The best guestimate by astronomers at the Australian National University is 70 sextillion (7 x 10^22),
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."
2007-01-15 20:08:06 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It is estimated that there are approximately 10^22 to 10^24 stars in the universe.
2007-01-15 18:47:09 · answer #3 · answered by gebobs 6 · 0⤊ 0⤋
There are about 100 billion galaxies, each containing 100 billion stars. So, if you know your powers of ten, it is a dead easy sum.
10^11 galaxies x 10^11 stars per galaxy
= 10^22 stars
That is 10,000,000,000,000,000,000,000
or 10 billion trillion stars
Katie Lynn was almost there - out by a factor of 10. Her number was 10^21.
2007-01-15 19:20:43 · answer #4 · answered by nick s 6 · 0⤊ 0⤋
more than there are grains of sand on all the beaches combined, being that the universe never ends due to the cosmological constant (einstein) this number is incalculable. in milky way alone there are hundreds of billions stars.
2007-01-15 19:06:53 · answer #5 · answered by clumsydevil 1 · 0⤊ 0⤋
There are infinity stars in the universe, because it is always expanding and there are always stars being born.
2007-01-15 18:27:07 · answer #6 · answered by someone on earth 3 · 0⤊ 0⤋
As many stars as there are grains of sand on the earth.
2007-01-15 18:26:16 · answer #7 · answered by 86Mets 4 · 0⤊ 0⤋
There are billions of galaxies each with billions of stars.
2007-01-16 00:19:48 · answer #8 · answered by ZeedoT 3 · 0⤊ 0⤋
15.
2007-01-15 18:29:57 · answer #9 · answered by Existence 3 · 0⤊ 0⤋
It is thought that there are billions and billions of galaxies and billions and billons of stars in each galaxy.
2007-01-15 20:35:53 · answer #10 · answered by futureastronaut1 3 · 0⤊ 0⤋