Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 25, Problem 4Q
To determine

The meaning of the statement, “we live in an expanding universe” and the quantity that is actually expanding.

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Students have asked these similar questions
Does Hubble's Law work well for galaxies in the Local Group (such as Andromeda)? No, because dark energy is accelerating the universe's expansion over those distances. No, because we do not know the precise value of Ho. No, because Hubble did not know the Local Group existed when he discovered his law. Yes, it works well for all galaxies. No, because galaxies in the Local Group are bound gravitationally together.
Cite an evidence that we are living in an expanding universe.
What is the difference between hot dark matter and cold dark matter? What difference does that make to cosmology?
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