The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 17, Problem 55EAP
The Speed of Supernova Debris. In the year 2001, debris moving outward from Supernova 1987A was seen hitting a preexisting ring of gas at a distance of 0.7 light-year around the star that exploded. Calculate the speed of that debris. How does the speed you find compare with the
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A star is observed to move away from us at a speed of 2.8km/s.
How far is the star ? Express your answer in light years.
I first tried 2.8 km/s divided by the Hobble constant of 21.4 km/s/MLY and got 0.13, but it's wrong. I then tried converting to light years and got 1.31E5, but it's still wrong.
Imagine that you are observing the light from a distant star that is located in a galaxy 100 million lightyears
away from you. By analysis of the starlight received, you are able to tell that the image we see is of a 10-
million-year-old star. You are also able to predict that the star will have a total lifetime of 50 million years, at
which point it will end in a catastrophic supernova.
a) How old does the star appear to be to us here on Earth now?
b) How long will it be before we receive the light from the supernova event?
c) Has the supernova already occurred? If so, when did it occur?
When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. Why does this redshift occur?
A
The star is at rest relative to Earth.
The star is moving toward Earth at decreasing speed.
The star is moving toward Earth at increasing speed.
D
The star is moving away from Earth.
DOOO
Chapter 17 Solutions
The Cosmic Perspective (9th Edition)
Ch. 17 - Prob. 1VSCCh. 17 - Prob. 2VSCCh. 17 - Prob. 3VSCCh. 17 - Prob. 4VSCCh. 17 - Prob. 1EAPCh. 17 - Prob. 2EAPCh. 17 - Prob. 3EAPCh. 17 - Prob. 4EAPCh. 17 - Prob. 5EAPCh. 17 - Prob. 6EAP
Ch. 17 - Prob. 7EAPCh. 17 - Prob. 8EAPCh. 17 - What will happen to Earth as the Sun changes in...Ch. 17 - Prob. 10EAPCh. 17 - Prob. 11EAPCh. 17 - Prob. 12EAPCh. 17 - Why cant iron be fused to release energy?Ch. 17 - Prob. 14EAPCh. 17 - Prob. 15EAPCh. 17 - Prob. 16EAPCh. 17 - Does It Make Sense? Decide whether the statement...Ch. 17 - Does It Make Sense? Decide whether the statement...Ch. 17 - Prob. 19EAPCh. 17 - Prob. 20EAPCh. 17 - Prob. 21EAPCh. 17 - Prob. 22EAPCh. 17 - Prob. 23EAPCh. 17 - Prob. 24EAPCh. 17 - Prob. 25EAPCh. 17 - Prob. 26EAPCh. 17 - Prob. 27EAPCh. 17 - Prob. 28EAPCh. 17 - Prob. 29EAPCh. 17 - Prob. 30EAPCh. 17 - Prob. 31EAPCh. 17 - Prob. 32EAPCh. 17 - Prob. 33EAPCh. 17 - Prob. 34EAPCh. 17 - Prob. 35EAPCh. 17 - Prob. 36EAPCh. 17 - Prob. 37EAPCh. 17 - Prob. 39EAPCh. 17 - Prob. 40EAPCh. 17 - Prob. 41EAPCh. 17 - Prob. 42EAPCh. 17 - Prob. 43EAPCh. 17 - Prob. 44EAPCh. 17 - Prob. 47EAPCh. 17 - Prob. 48EAPCh. 17 - Prob. 49EAPCh. 17 - Prob. 50EAPCh. 17 - Prob. 51EAPCh. 17 - Prob. 52EAPCh. 17 - Prob. 53EAPCh. 17 - Prob. 54EAPCh. 17 - The Speed of Supernova Debris. In the year 2001,...
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- An 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_forwardA stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardWhere in the Galaxy would you expect to find Type II supernovae, which are the explosions of massive stars that go through their lives very quickly? Where would you expect to find Type I supernovae, which involve the explosions of white dwarfs?arrow_forward
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