# How many stars are there in the universe?

In the observable universe there are about 10 billion galaxies.Assuming galaxies have an average of 100 billion stars each, theobservable universe has about 1 billion trillion… stars (or1,000,000,000,000,000,000,000).

# How many stars there are in universe?

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."

# How many stars are their in the universe?

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.

# How many galaxies are there in the observable universe?

at least 100 billion or more.

# How many atoms are in the observable universe?

There are perhaps something on the order of 1080 atoms in the observable universe, or at least that is a figure that seems to be tossed around a bit. A link can be found below…. We know that 1 mole of hydrogen is 1 gram, which has 6.022 x 10^23 atoms in it. We can easily approximate 1 kilogram (1000 grams) of any material to 1000 moles, since all atoms are based on the hydrogen model multiplied by X number of times corresponding to their atomic number. So, for example, although 1 kg of Iron is not 1000 moles, as Hydrogen is, but about 20 moles, one mole of Iron has 26 protons (29 neutrons) and 26 electrons, and has about 26 times the mass of hydrogen. So 1 kg of Iron is about 6.022x10^23 * 20 = 1.2 x 10^24 ~ 10^24 atoms, this is not far from 10^26 hydrogen's atoms. The most common element and atom in the universe is hydrogen anyway. Therefore 1 kg of any material can reasonably be approximated to about 1000 moles, which is about 6.022 x 10^26 atoms, or about 10^26 atoms per kilogram of mass in the universe. Earth has ~ 6 x 10^24 kg of mass. This is, 6 x 10^24 * 6 x 10^26 (number of atoms in 1 kg of substance) about 3.6 x 10^51 atoms or roughly 10^51 atoms. Now this might seem like very close to 10^80 atoms, but it is not. It would take approximately 10^30 Earths to reach that number, which is far more than our Galaxy has in mass. Our Galaxy has 1.4 x 10^42 kg of mass, which is about 10^45 moles. Multiplying that times Avogado's number (6.022 x 10^23, or about 10^23) we get 10^68 atoms in the Milky Way. There are 125 billion galaxies in the observable universe, which is 1.25 x 10^11, which is approximately 10^11 galaxies. From that: 10^68 * 10^11 we get 10^79, or about 10^80 atoms (10^78 if we count atoms as heavy as Iron, above which the universe does not naturally make on any grand scale; it goes up to Uranium, which is about 5 moles/kg) in the observable universe, with about as many electrons (1 hydrogen atom as per our model has 1 proton and 1 electron). ---- A second way is to use the known length of the observable universe. The observable universe is about 93 billion light years. Taking the volume of the universe as a sphere: 4/3*pi*R^3, the volume of the universe would be: (4/3)*3.141592*46.5^3 = ~ 4.2 x 10^23 cubic lightyears as the volume of the observable universe. Knowing that the universe is about 0.0000000000000000000042 percent matter, multiplying 4.2 x 10^23 by that gives us ~ 1.77 cubic lightyears of matter. 1 lightyear is 10 trillion kilometers, which is 1 million trillion centimeters or 10^18 cm in 1 lightyear. 1 cubic lightyear would then be (10^18)*(10^18)*(10^18)=10^54 cubic centimeters in 1 cubic lightyear so about 1.77x10^54 cubic cm of matter in the universe. It's estimated that there are about 10^17 atoms in an average cubic centimeter, so 1.77x10^54 * 10^17 = 1.77 x 10^81 which is about 10^81 atoms in the universe

# How many giant stars are there in the universe?

Nobody can really tell. There are an estimated 100,000,000,000,000,000,000 (100 quintrillion) probably more. Of those it's estimated to be about 3,000,000,000,000,000 (3 tho…usand trillion) will be hypergiants.

# How many stars observable to the naked eye are in the universe?

In general terms, with people of normal vision, there are in total around 8,000 stars observable with the naked eye. This breaks down to 4,000 in the north, and 4,000 in t…he south, non-overlapping. But in the north, for example, half the stars in your year-round sky are obscured by the sun; so roughly 2,000 stars are visible, on average, in the nighttime sky on any night. And this assumes very good viewing conditions. This may not sound like a very high number, but we have become used to hearing astronomical things described with correspondingly huge numbers. Try coming up with a method of estimating the number of stars you actually see; you probably won't be too far off from 2,000 if you do it carefully. We are talking about stars in the Milky Way; a small number of galaxies and clusters can be seen as 'stars' with the naked eye, but no stars outside of the Milky Way are observable..

# How many star and galaxy in your universe?

The Universe is a term used to explain the size of everything there is no way to know how big or of what content it is.

# How many different stars are there in the universe?

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.

# How many meters is the diameter of the observable universe?

700 million billion billion or 700,000,000,000,000,000,000,000,000

# How many stars are in this universe?

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 a…ll 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 probably not helpful.

Answered

In Astronomy

# How many stars on the universe?

Carl Sagan used to say, "there are 100 billion galaxies each with 100 billion suns." 100 billion x 100 billion = 1022 Although today, many scientists estimate that number to… be even larger still. There is no way of knowing as our understanding of the universe is still very small. It's like asking how many grains of sand there are on the Earth surface, it would be impossible to give an exact number. Funny enough, some say that the number of stars actually exceeds the number of grains of sand!

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In Uncategorized

# How many quarks in observable universe?

well my calculations got me to 4.2912121580307595ex45 quarks in the obsevable universe.

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In Cosmology

# How many light years is the observable universe?

The observable volume of the universe is spherical with a radius of around 14 billion light years. Comment : The answer depends a bit on definitions. Wikipedia's article… called "Observable universe" seems quite comprehensive. I'm inclined to go with the answer : "about 46 billion light years" as the radius of the observable universe, but I'm not an expert.

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In Astronomy

# How many stars and galaxies are there in the universe?

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.

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# How many moons are there in the observable universe?

Nobody knows, or will know. There are about 10 billion trillionstars (100 billion per galaxy) in the observable universe. If we assume that each star has the same amount of m…oons (i.e.170+) as our Sun, then the total will be around 1.7 trilliontrillion moons, but estimates vary.