Let’s model the Universe as a collection of galaxies similar to the MWG, spaced 3 Mpc...

Let’s model the Universe as a collection of galaxies similar to the MWG, spaced 3 Mpc apart. Assume that the MWG has about 1011 stars with an average mass of one solar mass, and gas+dust mass equal to the stellar mass. (a) What is the average baryonic (i.e. detectable) mass density in this Universe? [kg/m3] (b) The local interstellar medium density is about 1 hydrogen atom per cm3. How does this compare with the answer to part (a)? (b) What is Omega, and hence the fate of this Universe? (closed, flat, open)? (c) Suppose the dark matter content of all galaxies was 10x the baryonic matter. Now what is Omega?

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genius_generous answered 2 years ago

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