21ST C ASTRO EBOOK+SW5=SS+VGCRD+LEARN/DO
21ST C ASTRO EBOOK+SW5=SS+VGCRD+LEARN/DO
6th Edition
ISBN: 9780393870152
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 21, Problem 3QP
To determine

Cosmological red shifts are based on the observations of spectral lined from.

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The age of the universe can be determined if   a. the universe is flat.   b. the amount of dark matter in the universe can be accurately determined.   c. the rate of recession of the galaxies in the Local Group can be accurately determined.   d. the temperature of the cosmic background radiation can be accurately determined.   e. the Hubble constant and density of the universe can be accurately determined.
The density of the universe is   a. equal to the critical density if the universe is closed.   b. equal to the critical density if the universe is flat.   c. greater than the critical density if the universe is flat.   d. greater than the critical density if the universe is open.   e. none of the above.
What happens when galaxies collide? A. Star collisions will be rare but the shapes of the galaxies will be largely distorted. B. The shapes of the galaxies will be largely distorted and many of the stars of one galaxy will collide with stars of the other galaxy. C. The shapes of the galaxies will be distorted and many stars will collide with stars of the other galaxy, as well as with other stars in the same galaxy. D. Star collisions will be rare and the two galaxies will just pass through each other without any changes. Is the answer A? Thank you!
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