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.
Chapter 23 Solutions
21st Century Astronomy
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- Find the approximate mass of the dark and luminous matter in the Milky Way galaxy. Assume the luminous matter is due to approximately 1011 stars of average mass 1.5 times that of our Sun. and take the dark matter to be 10 times as massive as the luminous matter.arrow_forwardThe nearest neutron star (a collated star made primarily of neutrons) is about 3.00 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter 1021 m and thickness 1019 m, estimate the number of neutron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forwardShow that the velocity of a star orbiting its galaxy in a circular oibit is inversely proportional to the square root of its orbital radius, assuming the mass of the stars inside its orbit acts like a single mass at the center of the galaxy. You may use an equation from a previous chapter to support your conclusion, but you must justify its use and define all terms used.arrow_forward
- The nearest neutron star (a collated star made primarily of neutrons) is about 3.00 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter 1021 m and thickness 1019 m, estimate the number of neutron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forwardHow many galaxies like our own would it take Laid edge-to-edge to reach the nearest galaxy? (Hint: See Problem 9.)arrow_forwardWhat is the difference between our Solar System, our galaxy, and the Universe?arrow_forward
- The distance of a galaxy from our solar system is 10 Mpc. (a) What is the recessional velocity of the galaxy? (b) By what fraction is the starlight from this galaxy red shifted (that is, what is its z value)?arrow_forwardIn a spiral galaxy, the orbital speeds of stars far from the galaxy's center distance from the center increases. as the A. increase B. decrease C. are approximately the same D. The answer changes depending on the galaxy.arrow_forwardThe resolution of Olbers’s paradox suggests that it gets dark at night because a. the universe is not infinite in age. b. the universe is static. c. the universe is closed. d. a and b are true. e. all of the above are true.arrow_forward
- Eruptions of supermassive black holes in quasars may have been caused by a. novae. b. collisions or mergers with other galaxies. c. depleting all the material from the accretion disk. d. supernovae.arrow_forwardBlack hole candidates are conspicuous by their continuous or flickering emission of a. infrared light. b. ultraviolet light. c. gamma rays. d. X rays. e. all of the above.arrow_forwardOf the following objects, the one that produces the least energy is a a. supernova. b. Type 1 Seyfert galaxy. c. Type 2 Seyfert galaxy. d. quasar.arrow_forward
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