EBK THE COSMIC PERSPECTIVE
EBK THE COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135161753
Author: Voit
Publisher: VST
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Chapter 22, Problem 53EAP
To determine

The temperature of the cosmic microwave background.

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Hubble's law. Hubble found that distant galaxies are receding with a velocity proportional to their distance from where we are on Earth. For the ith Galaxy, vi=H0ri With us at the origin. Show that this recession of the galaxies from us does not imply that we are at the center of the universe. Specifically, take the Galaxy at r1 as a New origin and show that Hubble's law is still obeyed.
We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ... a.Expand and go supernova due to the expansion of the Universe   b.Fly away from the galaxy because the stars’ velocities are so large, and the galaxy would not have enough gravity to hold onto them   c.Orbit the center of the galaxy normally   d.Spiral in toward the center of the galaxy because most of the galaxy’s mass would be toward the center
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.

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EBK THE COSMIC PERSPECTIVE

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