Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 16.3, Problem 16.3CYU
To determine
The problem that was solved with the hypothesis of dark energy.
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What is dark matter, and what evidence exists for it? What effect does dark energy have on the expansion of the universe?
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As the universe expands, which type of cosmic energy has a density that falls off most quickly?
1. Dark energy density
2. Dark matter density
3. Normal matter density
4. Radiation energy density
Chapter 16 Solutions
Understanding Our Universe
Ch. 16.1 - Prob. 16.1CYUCh. 16.2 - Prob. 16.2CYUCh. 16.3 - Prob. 16.3CYUCh. 16.4 - Prob. 16.4CYUCh. 16.5 - Prob. 16.5CYUCh. 16.6 - Prob. 16.6CYUCh. 16 - Prob. 1QAPCh. 16 - Prob. 2QAPCh. 16 - Prob. 3QAPCh. 16 - Prob. 4QAP
Ch. 16 - Prob. 5QAPCh. 16 - Prob. 6QAPCh. 16 - Prob. 7QAPCh. 16 - Prob. 8QAPCh. 16 - Prob. 9QAPCh. 16 - Prob. 10QAPCh. 16 - Prob. 11QAPCh. 16 - Prob. 12QAPCh. 16 - Prob. 13QAPCh. 16 - Prob. 14QAPCh. 16 - Prob. 15QAPCh. 16 - Prob. 16QAPCh. 16 - Prob. 17QAPCh. 16 - Prob. 18QAPCh. 16 - Prob. 19QAPCh. 16 - Prob. 20QAPCh. 16 - Prob. 21QAPCh. 16 - Prob. 22QAPCh. 16 - Prob. 24QAPCh. 16 - Prob. 25QAPCh. 16 - Prob. 26QAPCh. 16 - Prob. 27QAPCh. 16 - Prob. 28QAPCh. 16 - Prob. 29QAPCh. 16 - Prob. 30QAPCh. 16 - Prob. 31QAPCh. 16 - Prob. 32QAPCh. 16 - Prob. 33QAPCh. 16 - Prob. 34QAPCh. 16 - Prob. 35QAPCh. 16 - Prob. 36QAPCh. 16 - Prob. 37QAPCh. 16 - Prob. 38QAPCh. 16 - Prob. 39QAPCh. 16 - Prob. 40QAPCh. 16 - Prob. 41QAPCh. 16 - Prob. 42QAPCh. 16 - Prob. 43QAPCh. 16 - Prob. 44QAPCh. 16 - Prob. 45QAP
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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.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_forwardWhat 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_forward
- 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.arrow_forwardDescribe at least two characteristics of the universe that are explained by the standard Big Bang model.arrow_forwardConstruct a timeline for the universe and indicate when various significant events occurred, from the beginning of the expansion to the formation of the Sun to the appearance of humans on Earth.arrow_forward
- What evidence shows that the Universe is expanding? What evidence shows that the Universe began with a Big Bang?arrow_forwardSince the time of Copernicus, each revolution in astronomy has moved humans farther from the center of the universe. Now it appears that we may not even be made of the most common form of matter. Trace the changes in scientific thought about the central nature of Earth, the Sun, and our Galaxy on a cosmic scale. Explain how the notion that most of the universe is made of dark matter continues this “Copernican tradition.”arrow_forwardWhy do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?arrow_forward
- What is the difference between hot dark matter and cold dark matter? How does this difference affect cosmology?arrow_forwardDescribe some possible futures for the universe that scientists have come up with. What property of the universe determines which of these possibilities is the correct one?arrow_forward
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