Percent area of the universe is galaxy?

AI Thread Summary
The discussion focuses on estimating the percentage of the universe's area occupied by galaxies. It mentions that the estimated number of galaxies in the observable universe is approximately 175 billion, with a total volume occupied by galaxies calculated to be 1.61875 x 10^23 cubic light years. In comparison, the volume of the observable universe is about 4.1 x 10^32 cubic light years. This highlights the vast emptiness of space, as the majority remains unoccupied despite the high number of galaxies. Ultimately, the conversation underscores the immense scale of the universe relative to the volume occupied by galaxies.
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%area of the universe is galaxy?

Hi.
I'm trying to determine the approximate percentage of the universe's area that is made up of galaxies for a question I was asked earlier this week. I have been looking everywhere and can not find any information of use. Can someone please help?
 
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Try critical density of the universe.
 


Thank you. That is just what I needed
 


Estimated number of galaxies in observable universe is N = 175 X 109, assuming average volume of each 22/7*100000*100000*30000 i.e. v = 9.25 X 1014 cubic light years. Total volume occupied by galaxies = N X V = 1618.75 X 1023 cubic light years.

Compare this with volume of observable universe = 4.1 × 1032 cubic light years.

The Hubble Ultra Deep Field shows 10000 galaxies, but still the photo is mostly black (space).

Space is big. Really big. You just won't believe how vastly, hugely, mindbogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space - Douglas Adams, The Hitchhiker's Guide to the Galaxy
 

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