21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 19.4, Problem 19.4CYU
To determine
The correct given option.
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18.
What is the name of the period in the Early Universe during which the Universe expanded very rapidly as a quantum system?
a.
Inflation.
b.
Cosmic Microwave Background.
c.
Gravitational Collapse.
d.
Big Bang Nucleosynthesis.
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
Which of the following might you expect to be an additional consequence of the fact that galaxies contain more mass than expected?A. The gravitational force between galaxies is greater than expected.B. Galaxies appear less bright than expected.C. Galaxies are farther away than expected.D. There are more galaxies than expected.
Chapter 19 Solutions
21st Century Astronomy
Ch. 19.1 - Prob. 19.1ACYUCh. 19.1 - Prob. 19.1BCYUCh. 19.2 - Prob. 19.2CYUCh. 19.3 - Prob. 19.3CYUCh. 19.4 - Prob. 19.4CYUCh. 19 - Prob. 1QPCh. 19 - Prob. 2QPCh. 19 - Prob. 3QPCh. 19 - Prob. 4QPCh. 19 - Prob. 5QP
Ch. 19 - Prob. 6QPCh. 19 - Prob. 7QPCh. 19 - Prob. 8QPCh. 19 - Prob. 9QPCh. 19 - Prob. 10QPCh. 19 - Prob. 11QPCh. 19 - Prob. 12QPCh. 19 - Prob. 13QPCh. 19 - Prob. 14QPCh. 19 - Prob. 15QPCh. 19 - Prob. 16QPCh. 19 - Prob. 17QPCh. 19 - Prob. 18QPCh. 19 - Prob. 19QPCh. 19 - Prob. 20QPCh. 19 - Prob. 21QPCh. 19 - Prob. 22QPCh. 19 - Prob. 23QPCh. 19 - Prob. 24QPCh. 19 - Prob. 25QPCh. 19 - Prob. 26QPCh. 19 - Prob. 27QPCh. 19 - Prob. 28QPCh. 19 - Prob. 29QPCh. 19 - Prob. 30QPCh. 19 - Prob. 31QPCh. 19 - Prob. 32QPCh. 19 - Prob. 33QPCh. 19 - Prob. 34QPCh. 19 - Prob. 35QPCh. 19 - Prob. 36QPCh. 19 - Prob. 37QPCh. 19 - Prob. 38QPCh. 19 - Prob. 39QPCh. 19 - Prob. 40QPCh. 19 - Prob. 41QPCh. 19 - Prob. 42QPCh. 19 - Prob. 43QPCh. 19 - Prob. 44QPCh. 19 - Prob. 45QP
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- Describe the main distinguishing features of spiral, elliptical, and irregular galaxies.arrow_forwardDescribe at least two characteristics of the universe that are explained by the standard Big Bang model.arrow_forwardStarting with the determination of the size of Earth, outline a sequence of steps necessary to obtain the distance to a remote cluster of galaxies. (Hint: Review the chapter on Celestial Distances.)arrow_forward
- What possible evidence do we have for the existence of "dark energy"? a. It blocks our view of distant parts of the universe b. The universe contains more light than has ever been emitted by stars. c. Expansion seems to be accelerating d. We see the cosmic background radiation in all directions e. All of the abovearrow_forward20. Gravitational lensing can be used to detect which component of the Universe? a. Dark Matter. b. Photons. c. Dark Energy. d. Electrons.arrow_forward13. Which of the following events in the early universe likely came first? a. Formation of the Earth. b. Big Bang Nucleosynthesis. c. Quantum Gravity Era (Planck Era). d. Inflation. e. Cosmic Microwave Background.arrow_forward
- It is believed that there is a black hole with a mass of approximately four million times the mass of the Sun near the centre of the Milky Way galaxy. Some stars are relatively close to this black hole. Assume that the semi-major axis of the orbit of one of these stars is 3.5 light days (ie. The distance that light would travel in 3.5 days).a) Find the orbital period of the star. (In years)b) Find the orbital speed of the star (in km/s), assuming that it is in a circular orbit.arrow_forwardList and briefly describe 3 of the main differences between spiral galaxies and largeelliptical galaxies.arrow_forwardAstronomers observe several galaxies in the Local Group that actually approach the Milky Way. The Andromeda Galaxy is the largest of these. Does this mean that the Hubble Law is incorrect?arrow_forward
- The Whirlpool galaxy is about 30 million light-years away. If you were in a spaceship that could travel at half of the speed of light, the amount of time it would take you reach the Whirlpool galaxy is __ (Be specific, use a number.)arrow_forwardWhat is dark matter? (200 words)arrow_forwardThe first evidence for the dark energy was that: a. the cosmic microwave background spectrum was a perfect black body. b. Einstein’s theory of gravity predicted that the Universe should collapse. c. Type Ia supernovae appeared dimmer than predicted by Hubble’s law. d. Cepheid variable stars showed that galaxies were farther away that thought. e. galaxies in clusters are moving too rapidly for the clusters to be bound.arrow_forward
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