21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 19.3, Problem 19.3CYU
To determine
Astronomers detect dark matter from which of the given options.
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Check out a sample textbook solutionStudents have asked these similar questions
We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would:
The 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.
Astronomers are always seeking to build bigger, more powerful telescopes, which will allow them to study faint galaxies that are very far away. Which of the following is the main reason they're so obsessed with studying very distant galaxies?
Group of answer choices
Light traveled much faster during the early history of the universe, so we can study how the speed of light has changed through time.
Very distant galaxies are more likely to contain planets than the Milky Way is, so we have a better chance of detecting life in those galaxies than we do in our own galaxy.
Since the light from these galaxies took so long to reach us, we're seeing them as they were when the universe was very young.
Strangely, distant galaxies are more like our Milky Way than the Milky Way's `neighbor' galaxies are, and astronomers would like to figure out why this is.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Explain what the mass-to-light ratio is and why it is smaller in spiral galaxies with regions of star formation than in elliptical galaxies.arrow_forwardWhy do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?arrow_forwardWhat is dark energy and what evidence do astronomers have that it is an important component of the universe?arrow_forward
- Describe the main distinguishing features of spiral, elliptical, and irregular galaxies.arrow_forward20. Gravitational lensing can be used to detect which component of the Universe? a. Dark Matter. b. Photons. c. Dark Energy. d. Electrons.arrow_forwardDescribe the age and temperature of stars that make up spiral galaxies and their location.arrow_forward
- propose an explanation for the lack of gas, dust, and young stars in elliptical 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_forwardExplain the term Gravitational lensing?arrow_forward
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