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Giant Stars are a type of star on the Hertzsprung Russel Diagram called AGB or Asymptotic Giant branch stars. They are stars between about 1 or less to 8 times the mass of the… sun that are nearing the end of their life. They can expand up to hundreds of times their original size. Depending on their luminosity, they are marked by a roman numeral 2 or 3 (II or III) in their spectral types. They range in color from red to blue. Our sun will be a red giant when it grows up in 5 billion years.
The most recent estimates place the number of stars in the observable universe at around 1023. That's a 1 with twenty-three zeros after it. More precisely, that would be 100 s…extillion. "The universe is so big, it doesn't even make sense to talk about how big it is."
In the observable universe there are about 80 to 100 billion galaxies with varying numbers of stars in each. A rough mean average for the number of stars per galaxy is 400 bil…lion. It is thought that there are from 30 to 70 billion trillion (i.e. 30 to 70 sextillion) stars in the observable universe. Whilst the estimates differ somewhat, the number of stars seems to be in the sextillions, which is a 1 followed by 21 zeros. There are many reasons why our estimates vary as much as they do. An important point to consider is that when we observe distant objects such as stars, we don't see them as they are now, but as they were in the past. The reason we see into the past as we look out into the universe is because the light we see takes a finite amount of time to reach us. As such, some of the stars we see, particularly those in very distant regions of space (relative to earth), may no longer be counted as stars. Conversely, new stars in distant regions may have already formed but we wouldn't see them until light from those stars reaches us here on earth.
There are about 2,500 stars visible to the naked eye at any one point at any one time on the Earth, and 5,800-8,000 total visible stars. But this is a very tiny fraction… of the stars the Milky Way is thought to have! Astronomers estimate that there are 200 billion to 400 billion stars contained within the Milky Way.
One of the largest stars known is YZ Canis Majoris. It is a Red Hypergiant star estimated to be up to 2,100 times the diameter of the Sun. This gives us a diameter of about 2,…923,200,000 km and an area of 9,183,503,644.97 km2. The earths diameter is 12,742 km and this gives an area of 40,030.17 km2. This means that it would take 229,414.53 earths to make up the area of YZ Canis Majoris.
Giant balls of gas, mainly hydrogen. The pressures and temperatures are so great that hydrogen atoms can fuse and release huge amounts of energy in nuclear fusion reactions. T…hey can therefore be said to be giant nuclear reactors.
Answer 1: Hundreds of billions of billions. Updated: As of 2009, it was estimated to be around 1023 stars in the observable universe. However, it was recently discovered… that we may have been missing most stars of the red dwarf variety and now it is beginning to look like the 1023 figure would now have to be tripled. So its about.... 3,000,000,000,000,000,000,000,000
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We can't be sure, and we don't even have any good guesses. The current best guess was just recently revised by a factor of three, tripling the number of stars in the universe …to 300 sextillion, or 300,000,000,000,000,000,000,000. The problem is that there are probably more stars even than that, because so many of them (and we CANNOT KNOW how many!) are small, dim red dwarf and brown dwarf stars, which cannot be seen even up close.
They make reasonable estimates, based on the number of galaxies, and the size of a typical galaxy.
The answer has to be estimated; for many reasons no one can ever know the exact numbers, whatever that might mean in this context. Estimates of the number of galaxies in the u…niverse range from about 170 billion to one trillion. One trillion is one thousand millions. Estimates of the number of stars range from around 70 sextillion to 300 sextillion. Seventy sextillion is 7 followed by 22 zeros. 300 sextillion is 3 followed by 23 zeros. Some estimate as high as 10 to the power 24, which is one followed by 24 zeros. You might think that 22, 23 and 24 are small numbers here, until you begin to consider that every single one of them represents a power of ten. The number is far beyond anything that any human mind can grasp on anything close to a practical level.
If the big-bang theory is true, the stars, planets, and other universal bodies were progressively formed, so there were much less stars than we have today, and the fomation of… new stars is compensated by the death of others.
There is no real count because new stars are created from time to time. There are BILLIONS AND BILLIONS (as Carl Sagan might have said). There are billions of stars in our Gal…axy and there are billions of galaxies. We don't have a very precise total. The usual estimate is: at least ten thousand billion billion. That's 1022 in scientific notation.
An average giant galaxy contains a trillion or more stars.