Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 12.3, Problem 12.3CYU
To determine

The reason why degenerate matter is different from ordinary matter.

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Galaxy seeds around which galaxies, clusters, and walls grew may have been   a. caused by hot dark matter.   b. caused by baryons.   c. the result of the separation of the electromagnetic and weak forces.   d. the result of freezing water molecules shortly after the universe became transparent to photons.   e. caused by microscopic random fluctuations in the infant universe.
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
1. The current (critical) density of our universe is pe = 10-26kg/m³. Assume the universe is filled with cubes with equal size that each contain one person of m = 100kg. What would the length of the side of such a cube have to be in order to give the correct critical density? How many hydrogen atoms would you need in a box of 1 m³ to reach the critical density? The matter we know, which consists mostly of hydrogen, constitutes only 4.8% of the current critical energy density of our universe. So how many hydrogen atoms are actually in a box of 1 m3 in our universe? Deep space is very empty and a much better vacuum than we can obtain on earth in a laboratory.
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