How many stars are there in the universe?
Enough that no one's ever going to actually count them to get an
In 2003 a group of Australian astronomers (unfortunately, I'm
getting this from BBC News and they neglected to mention
specifically who) measured the brightness of the galaxies in one
patch of sky, used that to estimate the number of stars they
contained, and then used THAT to estimate the number of stars in
the observable universe. The figure they came up with is about
7x10^22. (Roughly 0.1 mole, if you like).
Pieter van Dokkum of Yale University and coworkers revisited this in 2010 and found that there were probably more low-mass (and dim) red dwarf stars than was previously believed, which would make the number higher ... about 3x10^23 (roughly 0.5 mole).
I've seen other (more back-of-the-envelope and rougher) calculations suggesting the number could be as high as 10^24 (roughly 2 moles).
That's the observable universe. We don't (and probably never will) really know how if there's more to the universe than the part we can see, though some theories suggest it's at minimum anywhere from much bigger (250 times larger) to very very much bigger (>10^23 times larger), and it could be infinite. It's even possible that the universe is smaller than the observable universe, though this probably isn't terribly likely.
However, since the part of the universe that's outside the observable universe can by definition never interact with us in any way, we can ignore that and just say the number of stars in the part of the universe that actually matters is most likely 10^23, within an order of magnitude or so.
That is unknown, since the size of the Universe is unknown. In the so-called "observable Universe", it is estimated that there are about 170 billion galaxies; assuming that each galaxy has 100 billion stars, that would be in the order of 10 to the power 22 stars. However, the entire Universe is probably at least 1000 times bigger (in each of the three dimensions of space), and it may even be infinite, but this isn't currently known.
I estimate 100 E24 stars, 100 trillion Trillion stars..
There are over 10 billion trillion stars (100 billion+ per galaxy) in the universe.
Is it true Our galaxy contains many billions of universes and each universe contains many billions of stars.?
It has been suggested that "the total number of stars in the universe is greater than all the grains of sand on all the beaches on Earth." There may be more stars, as there are likely more than 170 billion galaxies in the observable universe, and there may be considerably more we cannot see. Galaxies have been observed that have as few as tens of millions of stars and as many as a hundred trillion…
No. For a start, there will not always be stars. A time will come when the stars stop shining, and there is not enough material in the Universe to form new stars. No. For a start, there will not always be stars. A time will come when the stars stop shining, and there is not enough material in the Universe to form new stars. No. For a start, there will not always be stars. A…
A star is a sun. The observable Universe has somewhere around 1011 galaxies; each galaxy might have around 1011 stars on average. That makes something like 1022 stars in the observable Universe. The entire Universe is probably much larger than the observable Universe, but nobody really knows how much larger.
What a great question! The Milky Way galaxy, of which the Sun is a part, has approximately one hundred billion stars. Keep in mind that stars and being created and destroyed all the time. As to how many galaxies there are, and a rough estimate of how many stars, it is hard to say because not all of the universe, such as it is, has been observed, and hypotheses vary wildly, so any guess is…
The amount of stars in the Universe is not know. The visible Universe has several hundred billion galaxies, each of which, on average, has perhaps a hundred billion stars or more. Even the exact shape of the Universe is an area of current research. In any case, it does seem that the Universe is much bigger than it was believed a few decades ago.
What i think is that its doing both at the same time. You see the universe is constantly imploding and exploding in many ways. Stars explode yet the particles of the explosion implode and help form other stars. Now we can take this information and think of it in many ways. Is the universe constantly expanding to the point in which it will become to much for itself and eventually implode and then explode into…
No-one can possibly know for sure, but the answer is probably billions. There are hundreds of billions of stars in our own Milky Way galaxy, many of which have solar systems of their own, and as many galaxies in the Universe as there are stars in our own galaxy (and the Milky Way is by no means a particularly large galaxy, just of average size). If you take all of this into account, the number…
Just in our galaxy - the Milky Way - there are several hundred billion stars. In the visible Universe, there are hundreds of billions of galaxies. It is not currently known how far the Universe extends, beyond the visible limits. A rough estimate, then, would be that there are 1011 x 1011 = 1022 stars (a one with 22 zeroes, that is), just in the visible Universe - the part that our instruments can reach…