COSMIC PERSPECTIVE
8th Edition
ISBN: 9780134073842
Author: Bennett
Publisher: PEARSON
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Chapter 23, Problem 12EAP
Briefly explain why dark matter is thought to have played a major role in the formation of galaxies and larger structures in the universe. What evidence suggests that larger structures are still forming?
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Chapter 23 Solutions
COSMIC PERSPECTIVE
Ch. 23 - Prob. 1VSCCh. 23 - Prob. 2VSCCh. 23 - Prob. 3VSCCh. 23 - Prob. 4VSCCh. 23 - Prob. 1EAPCh. 23 - Prob. 2EAPCh. 23 - Prob. 3EAPCh. 23 - Prob. 4EAPCh. 23 - Prob. 5EAPCh. 23 - Prob. 6EAP
Ch. 23 - Prob. 7EAPCh. 23 - Prob. 8EAPCh. 23 - Prob. 9EAPCh. 23 - Explain what we mean when we say that a neutrino...Ch. 23 - Prob. 11EAPCh. 23 - Briefly explain why dark matter is thought to have...Ch. 23 - What do the large-scale structures of the universe...Ch. 23 - Prob. 14EAPCh. 23 - Prob. 15EAPCh. 23 - Prob. 16EAPCh. 23 - Prob. 17EAPCh. 23 - Prob. 18EAPCh. 23 - Prob. 19EAPCh. 23 - Prob. 20EAPCh. 23 - Prob. 21EAPCh. 23 - Prob. 22EAPCh. 23 - Prob. 23EAPCh. 23 - Prob. 24EAPCh. 23 - Prob. 25EAPCh. 23 - Prob. 26EAPCh. 23 - Prob. 27EAPCh. 23 - Prob. 28EAPCh. 23 - Prob. 29EAPCh. 23 - Prob. 30EAPCh. 23 - Choose the best answer to each of the following....Ch. 23 - Prob. 32EAPCh. 23 - Prob. 33EAPCh. 23 - Prob. 34EAPCh. 23 - Choose the best answer to each of the following....Ch. 23 - Choose the best answer to each of the following....Ch. 23 - Choose the best answer to each of the following....Ch. 23 - Prob. 38EAPCh. 23 - Prob. 39EAPCh. 23 - Prob. 40EAPCh. 23 - Prob. 41EAPCh. 23 - Prob. 42EAPCh. 23 - Prob. 43EAPCh. 23 - Prob. 44EAPCh. 23 - Prob. 45EAPCh. 23 - Prob. 46EAPCh. 23 - Prob. 47EAPCh. 23 - Prob. 48EAPCh. 23 - Prob. 49EAPCh. 23 - Prob. 50EAPCh. 23 - Prob. 51EAPCh. 23 - Be sure to show all calculations dearly and state...Ch. 23 - Prob. 53EAPCh. 23 - Prob. 54EAPCh. 23 - Prob. 55EAPCh. 23 - Prob. 56EAPCh. 23 - Prob. 57EAPCh. 23 - Prob. 58EAPCh. 23 - Prob. 59EAPCh. 23 - Prob. 60EAPCh. 23 - Prob. 61EAP
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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
- Astronomers now think that there is a black hole with more than 4 milliion times the mass of our Sun at the center of our galaxy? Roughly how large would the event horizon of such a supermassive black hole be? a. the size of our moon b. about 4 light years across c. about 17 times the size of our sun d. about the size of an atom (so much mass really compresses the event horizon) e. this question can't be answered without knowing what kind of stars were swallowed by the black holearrow_forwarda) Briefly explain the term gravitational instability. b) State the difference between Hot and Cold Dark Matter. Briefly explain why Cold DarkMatter is needed in structure formation.arrow_forwardAn astronomer observed the motions of some galaxies. Based on his observations, he made the following statements. Which one of them is most likely to be false? Take Hubble's constant to be 67 km/s/Mpc. A. A galaxy observed to be moving away from us at a speed of 70 km/s is at a distance of about 1 Mpc from us. B. A galaxy observed to be moving away from us at a speed of 700 km/s is at a distance of about 10 Mpc from us. C. A galaxy observed to be moving away from us at a speed of 7000 km/s is at a distance of about 100 Mpc from us. D. A galaxy observed to be moving away from us at a speed of 70000 km/s is at a distance of about 1 Gpc from us. Is the answer D? Thank you!arrow_forward
- Briefly define what is meant by “dark matter” and “dark energy” in cosmology. Give an examplefor a candidate of dark matter, and an example for a dark energy candidate.arrow_forwardIf a galaxy is 9.0 Mpc away from Earth and recedes at 488 km/s, what is H0 (in km/s/Mpc)? km/s/Mpc What is the Hubble time (in yr)? years How old (in yr) would the universe be, assuming space-time is flat and the expansion of the universe has not been accelerating? How would acceleration change your answer? A.If the expansion of the Universe has been accelerating, the Universe could be substantially younger than the value entered above. BIf the expansion of the Universe has been accelerating, the Universe could be substantially older than the value entered above.arrow_forwardList and briefly describe 3 of the main differences between spiral galaxies and largeelliptical galaxies.arrow_forward
- Hubble's law. Hubble found that distant galaxies are receding with a velocity proportional to their distance from where we are on Earth. For the ith Galaxy, vi=H0ri With us at the origin. Show that this recession of the galaxies from us does not imply that we are at the center of the universe. Specifically, take the Galaxy at r1 as a New origin and show that Hubble's law is still obeyed.arrow_forwardProblem 5. Galaxy evolution 1. What is galaxy evolution and how can we quantify the evolution of galaxies using luminosity functions? 2. Sketch the cosmic star formation rate history (cosmic star birth history) and clearly indicate the cosmic down, cosmic noon and the present day. 3. Briefly explain the evolution/change of star formation rate over the history of the universe (i.e explain the sketch in 2).arrow_forwardAstronomers frequently say that "there are more stars in the universe than there are grains of sand on all the beaches on the earth". Given that a typical grain of sand is about 0.5 – 1.0 mm in diameter, estimate the number of grains of sand on all the earth's beaches. The diameter of the Earth is 12,742 km. a) About 1011 b) About 1016 c) About 1021. 6. Assume that a typical galaxy contains about 200 billion stars and that there are more than 150 billion galaxies in the known universe. Estimate the total number of stars in the universe. b) About 1022 a) About 1010 c) About 1016. 7. Compare the values of the number of grains of sand in all earth's beaches (from problem 5) with the number of stars in the universe (from problem 6) – which is greater? a) Number of sand grains b) number of stars c) they are about the same.arrow_forward
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