Recent findings in astrophysics suggest that the
Chapter 1, Problem 61(choose chapter or problem)
Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of radius light-years with an average total mass density of about Only about 4% of total mass is due to ordinary matter (such as protons, neutrons, and electrons). Estimate how much ordinary matter (in kg) there is in the observable universe. (For the light-year, see 19.)
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