Discover the Universe's Undensity with the Human Body Calculation

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SUMMARY

The discussion centers on calculating the volume a human body would occupy if it were distributed to match the Universe's critical density, estimated at approximately 6 Hydrogen atoms per cubic meter. The average molecular composition of the human body is approximated as 6.6 Carbon. Participants reference WMAP data indicating the Universe's matter density is closer to 0.27 times 6 Hydrogen atoms per cubic meter, and even lower at 0.04 times 6 Hydrogen atoms when excluding dark matter. The conversation highlights the stark contrast between human density and cosmic density.

PREREQUISITES
  • Understanding of cosmology concepts, particularly Omega-Matter
  • Basic knowledge of atomic and molecular composition, specifically Carbon
  • Familiarity with density calculations in physics
  • Awareness of WMAP data and its implications on cosmic density
NEXT STEPS
  • Research the implications of Omega-Matter in cosmology
  • Explore density calculations and their applications in astrophysics
  • Study WMAP data and its significance in understanding the Universe's structure
  • Investigate the role of dark matter in cosmic density assessments
USEFUL FOR

Astronomers, physicists, students of cosmology, and anyone interested in understanding the relationship between human density and the Universe's critical density.

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.
 
Space news on Phys.org
'any ideas folks?'
 
'A cube of side about 3 light-seconds (10^9m).'
 
'I guess no one likes this idea, lol.'
 

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