EBK COSMIC PERSPECTIVE FUNDAMENTALS, TH
2nd Edition
ISBN: 9780100663350
Author: Voit
Publisher: YUZU
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Chapter 1, Problem 5QQ
Could we see a galaxy that is 20 billion light-years away? (a) Yes, if we had a big enough telescope. (b) No, because it would be beyond the bounds of our observable universe (c) No, because a galaxy could not possible be that far away.
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How long ago was that galaxy right next door to our own Galaxy if it has always been receding at its present rate? Express your answer in years. Since the universe began when all galaxies were very close together, this number is a rough estimate for the age of the universe.
Chapter 1 Solutions
EBK COSMIC PERSPECTIVE FUNDAMENTALS, TH
Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Prob. 4QQCh. 1 - Could we see a galaxy that is 20 billion...Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Choose the best answer to each of the following....Ch. 1 - When we say the universe is expanding, we mean...Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Choose the best answer to each of the following....
Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Choose the best answer to each of the following....Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Alien Technology, Some people believe that Earth...Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Prob. 18SEQCh. 1 - Explain all answers clearly, using complete...Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Explain all answers clearly, using complete...Ch. 1 - Explain all answers clearly, using complete...
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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 have been making maps by observing a slice of the universe and seeing where the galaxies lie within that slice. If the universe is isotropic and homogeneous, why do they need more than one slice? Suppose they now want to make each slice extend farther into the universe. What do they need to do?arrow_forwardIn which type of model universe is space-time infinite in extent and positively curved? List all possibilities.arrow_forwardWhy cant an open universe have a center? How can a closed universe not have a center?arrow_forward
- What is the difference between hot dark matter and cold dark matter? How does this difference affect cosmology?arrow_forwardHow are distant (young) galaxies different from the galaxies that we see in the universe today?arrow_forwardSuppose the stars in an elliptical galaxy all formed within a few million years shortly after the universe began. Suppose these stars have a range of masses, just as the stars in our own galaxy do. How would the color of the elliptical change over the next several billion years? How would its luminosity change? Why?arrow_forward
- Suppose 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_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_forwardWhy couldnt atomic nuclei exist when the Universe was less than about 2 minutes old?arrow_forward
- We can detect 21-cm emission from other galaxies as well as from our own Galaxy. However, 21-cm emission from our own Galaxy fills most of the sky, so we usually see both at once. How can we distinguish the extragalactic 21-cm emission from that arising in our own Galaxy? (Hint: Other galaxies are generally moving relative to the Milky Way.)arrow_forwardWhat is the fate of a closed universe? In what case would that not be true?arrow_forwardAssume that the average galaxy contains 1011MSunand that the average distance between galaxies is 10 million light-years. Calculate the average density of matter (mass per unit volume) in galaxies. What fraction is this of the critical density we calculated in the chapter?arrow_forward
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