Is it possible to count no. of stars in the universe?

Answer 1

With the NASA's Hubble Telescope, we can now see out to almost 10 billion light years, Thus, we can see about 75% of the way out to our own observational horizon.

Using the Hubble Telescope, we can estimate that there are about 5 X 10^21 stars in the observable universe. The calculations are below.

The volume of the observable universe is:
(4/3 x 3.14159 x (S [Horizon])^3 = 9 x 10^30 cubic light years

Hubble's law of cosmic expansion states that an observer at any point in the universe will observe distant galaxies receding from him/her with radial velocities proportional to their distance from the observer.

Hubble's law is consistent with a general expansion of the space between galaxies (or galactic clusters), and is not a particular charactersitc of the galaxies (cluster) themselves. This statement means that the galaxies themselves are not changing in any way; only the regions between them are expanding with time.

With the NASA's Hubble Telescope, we can now see out to almost 10 billion light years, Thus, we can see about 75% of the way out to our own observational horizon. Using the Hubble Telescope, we can estimate that there are about 5 X 10^21 stars in the observable universe. Let us calculate an average stellar number denisty (number of stars per unit volume of space) This number is only a rough estimate, since the stars are not uniformly distributed throughout space, but are clustered into galaxies. Nevertheless, the result will be interesting and informative.

The volume of a sphere with radius r equal to 10 x 10^9 light years is:
(4/3) x 3.14159 x r^3 = 4 x 10^30 cubic light years

Thus, we may expect an average stellar density of:
(5 x 10^21 stars)/(4 x 10^30 cubic light years) = 10^-9 stars per cubic light year

Remember, if you did this same calculation inside of a single galaxy, the value would be considerably higher.

Answer 2

no there are to many.
estimates can be made but we will never be able to count them. Nor will we ever be able to count the number of galaxies for the same reason.

"A typical galaxy contains hundreds of billions of stars, and there are more than 100 billion (10^11) galaxies in the observable universe. While it is often believed that stars only exist within galaxies, intergalactic stars have been discovered.
Astronomers estimate that there are at least 70 sextillion (7×10^22) stars in the observable universe.[41] That is 230 billion times as many as the 300 billion in the Milky Way."
http://en.wikipedia.org/wiki/Stars

Answer 3

No.

It is not possible to count the excedeingly vast number of stars in the Universe. There are more than 200 Billion Stars within the Milky Way Galaxy, and outside of the Milky Way there are thousands and thousands of other galaxies with billions of stars in EACH one of them.

A simple example is as follows...
the core of the Milky Way galaxy is a clump or cluster of thousands of stars and lots of dust, so densely packed that it appears to us as a glowing white blob. It is so bright that the individual stars within cannot be identified.

At this time using the very best of our optical and radio telescope equipment that is available, scientists and astronomers can see out to a distance of 40 Billion Light Years in every possible direction from Earth. Beyond that
distance our best equipment just fails to provide any useful
information to us. That, however, is not the "end" of space or the Universe. We just cannot make out objects any further distant than that with our equipment. Maybe one day some new techniques or software will extend the distance out to say 60 or 70 Billion Light Years, or so. Only time will tell.

So the number of stars out there in the Universe is truly immense, and beyond our ability to count.

Answer 4

No.You can only count the all the stars in the universe if you are able to count each grain of sand on Earth.
It would be impossible because some stars we can't see are too far to see or the other stars are on the other side of Earth..Sky Glow is getting common all over the world and it's getting harder and harder to count stars.

Answer 5

I've heard scientist say that there are more stars in the sky as there are grains of sand on all the beaches on the Earth.
Number one I don't how the hell they could know that but I suppose what they are trying to say is there are plenty. Number two how come they don't mention all the deserts in the world too. If we can agree that there is a certain number that can be counted you can say that the number would be finite. In other words not infinite.

Answer 6

In mathematical theory, yes: A finite universe can only contain a finite number of stars.

In practice, no: With current technology, we can't even detect all the stars in the Milky Way, let alone other galaxies.

Answer 7

An estimation is your only bet.
Imagine trying to estimate the number of stars in the galactic center,by the time they get to that point they may not even be stars anymore.
At extreme distances the galaxies we see don't even exist to-day.

Answer 8

estimate MAYBE but not count. even an estimate is a long shot. thousands or millions of stars are created and destroyed everyday. even if we use their reflection of light or any other sign of their existence, it wouldnt be accurate since the reflection light or any other signal from that star may take years to get to earth. stars are that far and it will take that long even with the speed of light.

Answer 9

Just like your hair and the sand in the beach you cannot count the stars.

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Answer 10

actually,no,the stars cannot be counted.