Discover the Universe's Undensity with the Human Body Calculation

  • Thread starter Chaos' lil bro Order
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In summary, the critical density of the Universe is equal to about 6 Hydrogen atoms/meter cubed. If a human body were to be spread out to fit this density, it would occupy a volume of approximately 1 cubic meter. However, considering the average molecular makeup of a human body, this number may vary. The best WMAP data suggests the Universe's matter density is closer to 0.27 x 6 Hydrogen atoms/meter cubed, and even smaller if we exclude dark matter. These numbers provide perspective on the overall undensity of the Universe.
  • #1
Chaos' lil bro Order
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Greetings,

I was thinking about Cosmology and Omega-Matter. The critical density of the Universe is equal to about 6 Hydrogen atoms/ meter cubed. If we were to smear a human body out to fit it to this density, how big a volume would the human body smear out to be?

Assume, the human body occupies a volume of ~1 meter cubed

Assume, the average Mol. in the human body is 6,6-Carbon

Can anyone figure this out? It seems like a fun way to gain perspective on just how undense the Universe is.



P.S. Really our best WMAP data says the Universe's matter density is closer to 0.27 x 6 Hydrogen atoms. If we exclude dark matter, this number gets even smaller and becomes 0.04 x 6 Hydrogen atoms/ meter cubed.
 
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  • #2
'any ideas folks?'
 
  • #3
'A cube of side about 3 light-seconds (10^9m).'
 
  • #4
'I guess no one likes this idea, lol.'
 

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