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Hi all,

Sorry if this has been asked before but every time i do research in to this i get different answers from different sauces. Not sure if im looking at out dated information or not so im hoping if i ask my questions here i can get the most up to date answer. So my questions are;

1. How many Stars are their in our Galaxy?

2. How many Galaxies are their in our Local Group?

3. How many Galaxy Clusters are their in our Local Supercluster?

4. How many Superclusters have we found so far?

5. How many starts in total are their in all of the Superclusters?

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Probably millions, these mega numbers are beyond imagination. How can you imagine minus one for example ? Unless you're an honest tax payer .

What is interesting is distribution, for example stars in galaxies are as dense as one pea in St.Paul's cathedral , from one another. What is interesting is things like the event that lead to globular clusters being left after a cataclysmic event after the BB.

The distribution of galaxy clusters has almost undertones of intelligent design, Its certainly worth thinking about the bigger picture when observing the skies ,

Nick.

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Yes from what i can see of answers to this post and during my research the numbers always varies. But if i take the most common answers this is what i get at as ruff guess.

 

1. How many Stars are their in our Galaxy? 
I get so many different numbers from this search but the most common one is 100 Billion Stars in the Milkyway.

2. How many Galaxies are their in our Local Group?
Once again I get many different numbers but 54 Galaxies is the one that repeats the most. Also im told the ruff amount of stars in our Local Group is 1.5 Trillion


3. How many Galaxy Clusters are their in our Local Supercluster?
from what i can tell our Local Supercluster is called  Laniake, and this has 500 regular clusters. So assuming each of these 500 clusters has about 54 Galaxies then that gives us 27000 Galaxies. So if each cluster has about 1.5 Trillion stars thats 500 x 1.5. giving us 40.5 Trillion Stars in our Supercluster.

4. How many Superclusters have we found so far?
If google is accurate we have found about 10 Million Superclusters. So assuming each Supercluster has 27000 galaxies thats 10 Million x 27000 = Two Hundred Seventy Billion Galaxies, a number to big for me to know how to type as a number.

5. How many starts in total are their in all of the Superclusters?
So if we go with Two Hundred Seventy Billion galaxies and each galaxy has about 100 Billion stars thats Two Hundred Seventy Billion x 100 Billion thats a sum i cant get any calculator to work out.

 

I know not all Galaxies have the same number of stars and that each Cluster and Supercluster will have different numbers of Galaxies in them. I also know we are not the largest of any of these categories but at least its a ruff guess and im sure the actual number is far larger.

Edited by Joe_Dinsdale

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1: Value will change at regular intervals, presently 100 billion is most quoted but as half the values are in publications like papers or the web you tend to find that next weeks artical has to have more then this weeks artical. Red dwarfs and brown dwarfs make it difficult as every so often the calculated possible number of these changes, so suddenly the number jumps. Andromeda is another good example, I have read that it is smaller, equal and bigger then the Milky Way. Suppose it has to be at least one of them.

2: Might be very low, sure I read somewhere that the Milky Way, Andromeda ans Triangulum may not be bound gravitationally to the Virgo supercluster. In effect we are not part of a supercluster. We could be just 3 (M31+M33+MW) and I am sure I have read that we are 6.  Have to remember that it was only in 1923 that Hubble determined that there were other galaxies besides ours, 93 years ago it was thought that the Milky Way was everything. And I would not be too surprised that by the time of the 100th anniversary (7 years to go) a lot will change again.

One option is to access the Gaia data and see if anything comes out of that. At last in regards to our galaxy.

The rest is very likely open to a lot of arguement, especially 5 as there is really no way to measure the number accuratley. We have trouble detecting red dwarfs and brown dwarfs in this region of the Milky Way, never mind bits of the Milky Way that are further away and out of sight so not chance of what is in other galaxies. Any idea of the number of red and brown dwarfs that have formed in the Pleiades cluster ?

I would say that any numerical value will have a potential spread of about 5x or 10x the value suggested. Like saying 5 million but with the possibility of up to 25 million, and maybe 50 million. In effect meaningless.

 

Edited by ronin

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