Cosmolgy- Density of the Universe

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SUMMARY

The discussion centers on calculating the average distance one can see in any direction before encountering a galaxy, given an average galaxy density of 0.9 Mpc-3 and a galaxy diameter of 30 kpc. Participants agree that under these conditions, one would encounter a galaxy regardless of the direction of observation. The terms kiloparsec (kpc) and megaparsec (Mpc) are clarified, with kpc being 1,000 parsecs and Mpc being 1,000,000 parsecs.

PREREQUISITES
  • Understanding of cosmological density concepts
  • Familiarity with the units of distance in astronomy, specifically kiloparsecs (kpc) and megaparsecs (Mpc)
  • Basic knowledge of Euclidean space principles
  • Awareness of galaxy structure and dimensions
NEXT STEPS
  • Research the implications of galaxy density on cosmic structure
  • Study the concept of Euclidean space in cosmology
  • Explore the significance of kiloparsecs and megaparsecs in astronomical measurements
  • Investigate the distribution of galaxies in the universe
USEFUL FOR

Astronomers, astrophysicists, and students of cosmology seeking to understand galaxy distribution and density in the universe.

EP
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Assume the universe has an average galaxy density of p=0.9 Mpc^-3. Each galaxy has a diameter of 30 kpc. How far would you see on average in any direction before your line of sight would hit a galaxy? Assume a Eucledian spcae and infinitely large and infinitely old universe.

Help get me started.
Thanks

My guess is the answer is that no matter where you look you'll see a galaxy under these conditions.
 
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EP said:
Assume the universe has an average galaxy density of p=0.9 Mpc^-3. Each galaxy has a diameter of 30 kpc. How far would you see on average in any direction before your line of sight would hit a galaxy? Assume a Eucledian spcae and infinitely large and infinitely old universe.

Help get me started.
Thanks

My guess is the answer is that no matter where you look you'll see a galaxy under these conditions.
What units are are kpc and mpc?

AM
 
Kiloparsec and Megaparsec
 

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