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a) The Milky Way has about 10¹¹ stars. Assuming that each star has a mass of about M* ~ 2 x 1031 kg, and that galaxies are typically separated 1 Mpc, calculate the average density of the universe (in SI units). b) Define the critical density as used in cosmology. Write down an expression of the critical density in terms of the Hubble parameter. = c) Assume that Ho 68kms ¹Mp¹. Calculate the critical density of the universe today. Express your result in SI units.

a) The Milky Way has about 10¹¹ stars. Assuming that each star has a mass of about M* ~ 2 x 1031 kg, and that galaxies are typically separated 1 Mpc, calculate the average density of the universe (in SI units). b) Define the critical density as used in cosmology. Write down an expression of the critical density in terms of the Hubble parameter. = c) Assume that Ho 68kms ¹Mp¹. Calculate the critical density of the universe today. Express your result in SI units.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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a) The Milky Way has about 10¹¹ stars. Assuming that each star has a mass of about M* ~ 2 x 1031 kg, and that galaxies are typically separated 1 Mpc, calculate the average density of the universe (in SI units). b) Define the critical density as used in cosmology. Write down an expression of the critical density in terms of the Hubble parameter. = c) Assume that Ho 68kms ¹Mp¹. Calculate the critical density of the universe today. Express your result in SI units.
Transcribed Image Text:a) The Milky Way has about 10¹¹ stars. Assuming that each star has a mass of about M* ~ 2 x 1031 kg, and that galaxies are typically separated 1 Mpc, calculate the average density of the universe (in SI units). b) Define the critical density as used in cosmology. Write down an expression of the critical density in terms of the Hubble parameter. = c) Assume that Ho 68kms ¹Mp¹. Calculate the critical density of the universe today. Express your result in SI units.
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