21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 23, Problem 8QP
To determine

The characteristics of the galaxy that can be calculated once redshift is known.

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The orbit of the binary pulsar PSR 1936+16, studied by Taylor and Hulse,   a. is so small that the orbital period is smaller than the pulsar period.   b. is growing smaller, presumably by emitting gravitational waves.   c. provides evidence that it is being orbited by at least 6 planets the size of Jupiter.   d. shows large changes each time an X ray burst is emitted from the system.   e. contains a white dwarf and a black hole.
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.
If our universe is expanding, what are the implications for the separation between two stars within our galaxy?   A. The two stars are moving farther apart.   B. The two stars are moving closer together.   C. The distance between the two stars is unaffected.    D. The question is impossible to answer without more information.
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