Cosmic Perspective, The, Books a la Carte Edition (8th Edition)
8th Edition
ISBN: 9780134110318
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 20, Problem 21EAP
Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly; not all of these have definitive answers, so our explanation is more important than your chosen answer.
21. After measuring a galaxy’s redshift, I used Hubble’s law to estimate its distance.
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) what are some fundamental properties of late type galaxies that our theories of galaxy formation must reproduce?
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1. What is wave-particle duality? How does it apply to photons and electrons? Why do we not generally observe this in everyday life?
2. What is the Hubble Law? What does it say about the evolution of the universe? What does it have to do with redshift?
Why are so many astronomical objects in the universe flat today? (Like the solar system, Saturn's ring, black hole accretion discs) Let's focus on our galaxy. Originally, the galaxy was a huge spherical cloud of gas and dust, much larger than it is today, and rotating much more slowly. Explain using gravity and the conservation of angular momentum, why the galaxy today is a flat disc that rotates faster.
Chapter 20 Solutions
Cosmic Perspective, The, Books a la Carte Edition (8th Edition)
Ch. 20 - Prob. 1VSCCh. 20 - Prob. 2VSCCh. 20 - Prob. 3VSCCh. 20 - Prob. 4VSCCh. 20 - Use the following questions to check your...Ch. 20 - Prob. 6VSCCh. 20 - Why do we need to understand the evolution of the...Ch. 20 - Prob. 2EAPCh. 20 - Prob. 3EAPCh. 20 - Prob. 4EAP
Ch. 20 - Prob. 5EAPCh. 20 - Prob. 6EAPCh. 20 - Prob. 7EAPCh. 20 - Prob. 8EAPCh. 20 - Prob. 9EAPCh. 20 - Prob. 10EAPCh. 20 - Prob. 11EAPCh. 20 - Prob. 12EAPCh. 20 - Prob. 13EAPCh. 20 - Prob. 14EAPCh. 20 - What is the cosmological horizon, and what...Ch. 20 - Prob. 16EAPCh. 20 - Prob. 17EAPCh. 20 - Prob. 18EAPCh. 20 - Prob. 19EAPCh. 20 - Prob. 20EAPCh. 20 - Decide whether the statement makes sense (or is...Ch. 20 - Prob. 22EAPCh. 20 - Prob. 23EAPCh. 20 - Prob. 24EAPCh. 20 - Prob. 25EAPCh. 20 - Prob. 26EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 28EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 30EAPCh. 20 - Prob. 31EAPCh. 20 - Prob. 32EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Choose the best answer to each of the following....Ch. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 36EAPCh. 20 - Prob. 37EAPCh. 20 - Prob. 38EAPCh. 20 - Prob. 39EAPCh. 20 - Prob. 40EAPCh. 20 - Prob. 41EAPCh. 20 - Prob. 42EAPCh. 20 - Prob. 43EAPCh. 20 - Prob. 44EAPCh. 20 - Prob. 45EAPCh. 20 - Prob. 46EAPCh. 20 - Prob. 47EAPCh. 20 - Prob. 48EAPCh. 20 - Prob. 49EAPCh. 20 - Prob. 50EAPCh. 20 - Prob. 51EAPCh. 20 - Prob. 52EAPCh. 20 - Prob. 53EAPCh. 20 - Prob. 54EAPCh. 20 - Prob. 55EAPCh. 20 - Prob. 56EAPCh. 20 - Prob. 57EAPCh. 20 - Prob. 58EAPCh. 20 - Prob. 59EAP
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- 2. List 3 methods used to measure cosmic distances - choose 1 of the techniques and briefly explain in 1-2 sentences how astronomers use this method to calculate cosmic distance.arrow_forwardDescribe the four rungs in the distance-measurement ladder used to determine the distance to a galaxy lying 5 Mpc away. What are pulsars, and how are they related to neutron stars? Why aren’t all neutron stars seen as pulsars?arrow_forwardWhat is dark energy? What makes it different from other forms of energy and how do we know it exists?arrow_forward
- Can an elliptical galaxy evolve into a spiral? Explain your answer. Can a spiral turn into an elliptical? How?arrow_forwardThe first objects to collapse gravitationally after the Big Bang might have been globular cluster-size galaxy pieces, with masses around 106 solar masses. Suppose you merge two of those together, then merge two larger pieces together, and so on, Lego-style, until you reach a Milky Way mass, about 1012 solar masses. How many merger generations would that take, and how many original pieces? (Hint: Think in powers of 2.)arrow_forwardThe hydrogen Balmer line H? has a wavelength of 486.1 nm. It is shifted to 536.0 nm in a quasar's spectrum. What is the redshift of this quasar? (Hint: What is Δ??)arrow_forward
- What are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured?arrow_forwardIt is possible to derive the age of the universe given the value of the Hubble constant and the distance to a galaxy, again with the assumption that the value of the Hubble constant has not changed since the Big Bang. Consider a galaxy at a distance of 400 million light-years receding from us at a velocity, v. If the Hubble constant is 20 km/s per million light-years, what is its velocity? 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.arrow_forwardBriefly describe the main parts of our Galaxy.arrow_forward
- There is still some uncertainty in the Hubble constant. (a) Current estimates range from about 19.9 km/s per million light-years to 23 km/s per million light-years. Assume that the Hubble constant has been constant since the Big Bang. What is the possible range in the ages of the universe? Use the equation in the text, T0=1H , and make sure you use consistent units. (b) Twenty years ago, estimates for the Hubble constant ranged from 50 to 100 km/s per Mps. What are the possible ages for the universe from those values? Can you rule out some of these possibilities on the basis of other evidence?arrow_forwardPart 1 Copy and answer the ff. questions in continuation of your activity 4 on your booklet 3. 1. Why is Big Bang the most reliable theory on the formation of the universe? Give its evidences and explain them briefly on how you understood them. 2. What is fundamental or elementary particles? Where did they come from? 3. Why did atoms not yet formed during the early times in the big bang timeline? How did the subatomic particles formed? What composed them? 3. Are you convince that their are much basic part than the subatomic particles? Defend your answers. 4. What are stars? What make them up? Why is that the smaller stars live longer than the massive and giant stars? 5. What is nuclear fusion? Where it happens? What is its role in the life of stars? What it does with gravity? 6. If giants stars already expended its fuel and were all converted to Iron, SUPERNOVA happens, how this event occured? 7. What is nucleosynthesis? What are the 3 types of nucleosynthesis and what are the…arrow_forward
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