ESSEN.COSMIC PERSPECTIVE W/MASTAST >IC
2nd Edition
ISBN: 9781269945066
Author: Bennett
Publisher: PEARSON C
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Textbook Question
Chapter 16, Problem 45EAP
Unanswered Questions. Briefly describe one important but unanswered question related to galaxy evolution. If you think it will be possible to answer that question in the future, describe how we might find an answer, being as specific as possible about the evidence necessary to answer the question. If you think the question will never be answered, explain why you think it is impossible to answer.
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Suppose there are l0,000 civilizations broadcasting radio signals in the Milky Way GaIaxy right now. On average, how many stars would we have to search before we would expect to hear a signal? Assume there are 500 billion stars in the galaxy. How would the answer change if there were only 100 civilizations instead of 10,000?
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Chapter 16 Solutions
ESSEN.COSMIC PERSPECTIVE W/MASTAST >IC
Ch. 16 - Prob. 1VSCCh. 16 - Prob. 2VSCCh. 16 - Answer questions 1-3 based on Figure 16.18,...Ch. 16 - Prob. 4VSCCh. 16 - Prob. 5VSCCh. 16 - Prob. 6VSCCh. 16 - Prob. 7VSCCh. 16 - Prob. 1EAPCh. 16 - Prob. 2EAPCh. 16 - Prob. 4EAP
Ch. 16 - Prob. 3EAPCh. 16 - Prob. 5EAPCh. 16 - Prob. 6EAPCh. 16 - Prob. 7EAPCh. 16 - Prob. 8EAPCh. 16 - Prob. 9EAPCh. 16 - Prob. 10EAPCh. 16 - Prob. 11EAPCh. 16 - Prob. 12EAPCh. 16 - Prob. 13EAPCh. 16 - Prob. 14EAPCh. 16 - Prob. 15EAPCh. 16 - Prob. 16EAPCh. 16 - Prob. 17EAPCh. 16 - Prob. 18EAPCh. 16 - Prob. 19EAPCh. 16 - Prob. 20EAPCh. 16 - Prob. 21EAPCh. 16 - Prob. 22EAPCh. 16 - Prob. 23EAPCh. 16 - Prob. 24EAPCh. 16 - Prob. 25EAPCh. 16 - Prob. 26EAPCh. 16 - Prob. 27EAPCh. 16 - Prob. 28EAPCh. 16 - Prob. 29EAPCh. 16 - Prob. 30EAPCh. 16 - Prob. 31EAPCh. 16 - Prob. 32EAPCh. 16 - Prob. 33EAPCh. 16 - Prob. 34EAPCh. 16 - Prob. 35EAPCh. 16 - Prob. 36EAPCh. 16 - Prob. 37EAPCh. 16 - Prob. 38EAPCh. 16 - Prob. 39EAPCh. 16 - Prob. 40EAPCh. 16 - Prob. 41EAPCh. 16 - Prob. 42EAPCh. 16 - Prob. 43EAPCh. 16 - Prob. 44EAPCh. 16 - Unanswered Questions. Briefly describe one...Ch. 16 - Prob. 46EAPCh. 16 - Prob. 47EAPCh. 16 - Prob. 48EAPCh. 16 - Hubble’s Galaxy Types. How would you classify the...Ch. 16 - Prob. 50EAPCh. 16 - Galaxies at Great Distances. The most distant...Ch. 16 - Universe on a Balloon. In what ways is the surface...Ch. 16 - Prob. 53EAPCh. 16 - Prob. 54EAPCh. 16 - Prob. 56EAPCh. 16 - Prob. 57EAPCh. 16 - Prob. 58EAPCh. 16 - Prob. 59EAPCh. 16 - Prob. 60EAPCh. 16 - Prob. 61EAPCh. 16 - Prob. 62EAPCh. 16 - Prob. 63EAPCh. 16 - Prob. 64EAPCh. 16 - Prob. 65EAP
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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
- Briefly describe the main parts of our Galaxy.arrow_forwardThink of our Milky Way Galaxy as a flat disk of diameter 100,000 light-years. Suppose we are one of 1000 civilizations, randomly distributed through the disk, interested in communicating via radio waves. How far away would the nearest such civilization be from us (on average)?arrow_forwardWhat evidence can you give that we live in a galaxy?arrow_forward
- Suppose a galaxy formed stars for a few million years and then stopped (and no other galaxy merged or collided with it). What would be the most massive stars on the main sequence after 500 million years? After 10 billion years? How would the color of the galaxy change over this time span? (Refer to Evolution from the Main Sequence to Red Giants.)arrow_forwardSuppose astronomers discover a radio message from a civilization whose planet orbits a star 35 lightyears away. Their message encourages us to send a radio answer, which we decide to do. Suppose our governing bodies take 2 years to decide whether and how to answer. When our answer arrives there, their governing bodies also take two of our years to frame an answer to us. How long after we get their first message can we hope to get their reply to ours? (A question for further thinking: Once communication gets going, should we continue to wait for a reply before we send the next message?)arrow_forwardSuppose the Sagittarius dwarf galaxy merges completely with the Milky Way and adds 150,000 stars to it. Estimate the percentage change in the mass of the Milky Way. Will this be enough mass to affect the orbit of the Sun around the galactic center? Assume that all of the Sagittarius galaxy’s stars end up in the nuclear bulge of the Milky Way Galaxy and explain your answer.arrow_forward
- Thinking about the ideas of space and time in Einstein’s general theory of relativity, how do we explain the fact that all galaxies outside our Local Group show a redshift?arrow_forwardSuppose the Milky Way Galaxy were truly isolated and that no other galaxies existed within 100 million light-years. Suppose that galaxies were observed in larger numbers at distances greater than 100 million light-years. Why would it be more difficult to determine accurate distances to those galaxies than if there were also galaxies relatively close by?arrow_forwardDescribe what is meant by Olbers’ paradox. Explain how it is solved by our modern understanding of the Universe.arrow_forward
- What is a Worm Hole? How can we travel into the Worm Hole?arrow_forwardSuppose we could measure the distance to a galaxy using one of the distance techniques listed in Table 26.2 and it turns out to be 200 million light-years. The galaxy’s redshift tells us its recessional velocity is 5000 km/s. What is the Hubble constant?arrow_forward
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