COSMIC PERSPECTIVE LL FD
9th Edition
ISBN: 9780135877074
Author: Bennett
Publisher: PEARSON
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Chapter 6, Problem 38EAP
To determine
To Discuss: The pros and cons of each telescope for its usage in observing matter around a black hole.
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Astronomers are always seeking to build bigger, more powerful telescopes, which will allow them to study faint galaxies that are very far away. Which of the following is the main reason they're so obsessed with studying very distant galaxies?
Group of answer choices
Light traveled much faster during the early history of the universe, so we can study how the speed of light has changed through time.
Very distant galaxies are more likely to contain planets than the Milky Way is, so we have a better chance of detecting life in those galaxies than we do in our own galaxy.
Since the light from these galaxies took so long to reach us, we're seeing them as they were when the universe was very young.
Strangely, distant galaxies are more like our Milky Way than the Milky Way's `neighbor' galaxies are, and astronomers would like to figure out why this is.
Part B: Messier 87 (M87)
You might remember the first *real* image
of a supermassive black hole that has ever
been achieved, released by the Event
Horizon Telescope Collaboration in 2017
(see image to the right). Its mass was
measured to be approximately 6 x
10° times the Sun's mass (1000 times more
massive than Sagittarius A*!)
Image credit: Event Horizon Telescope Collaboration
8.
Part a) Do the same calculation as Question 6 & 7, except now multiply the sun's mass by 6
x 10° before plugging it in to the Schwarzschild radius equation. Then divide the number by
1 AU in meters (Again just submit your answer, do not submit the unit AU).
Part b) How does the radius of M87 compare to the radius of Sagittarius A*? (Divide the
radius of M87 by the radius of Sagittarius A*.)
Suppose a spectral line from an object in space was shifted from 5007.0 to 5100.0 Angstroms. What can we tell about this object?
A) It is a star.
B) It is very cold.
C) It is blueshifted, hence coming towards us.
D) Its radial velocity is positive, meaning it is moving away from us.
E) It is a planet in a distant galaxy.
F) It is an exoplanet.
Chapter 6 Solutions
COSMIC PERSPECTIVE LL FD
Ch. 6 - Prob. 1VSCCh. 6 - Prob. 2VSCCh. 6 - Prob. 3VSCCh. 6 - Prob. 4VSCCh. 6 - How does your eye focus light? How is a glass lens...Ch. 6 - How does a camera record light? How are images...Ch. 6 - What are the two key properties of a telescope,...Ch. 6 - What is the diffraction limit, and how does it...Ch. 6 - How do reflecting telescopes differ from...Ch. 6 - What are the three basic categories of...
Ch. 6 - Prob. 7EAPCh. 6 - What do we mean by spectral resolution? Why is...Ch. 6 - List at least three ways in which Earth's...Ch. 6 - 10. Describe how deeply each portion of the...Ch. 6 - Prob. 11EAPCh. 6 - Prob. 12EAPCh. 6 - Prob. 13EAPCh. 6 - Prob. 14EAPCh. 6 - Prob. 15EAPCh. 6 - Prob. 16EAPCh. 6 - Prob. 17EAPCh. 6 - Prob. 18EAPCh. 6 - Prob. 19EAPCh. 6 - Prob. 20EAPCh. 6 - Prob. 21EAPCh. 6 - Prob. 22EAPCh. 6 - Prob. 23EAPCh. 6 - Prob. 24EAPCh. 6 - Prob. 25EAPCh. 6 - Prob. 26EAPCh. 6 - Prob. 27EAPCh. 6 - Prob. 28EAPCh. 6 - Prob. 29EAPCh. 6 - Prob. 30EAPCh. 6 - Prob. 31EAPCh. 6 - Prob. 32EAPCh. 6 - Prob. 37EAPCh. 6 - Prob. 38EAPCh. 6 - Prob. 39EAPCh. 6 - Prob. 40EAPCh. 6 - Prob. 41EAPCh. 6 - Prob. 42EAPCh. 6 - Prob. 43EAPCh. 6 - Prob. 44EAPCh. 6 - Prob. 45EAPCh. 6 - Prob. 46EAPCh. 6 - Prob. 50EAPCh. 6 - Close Binary System. Suppose that two stars in a...Ch. 6 - Prob. 52EAPCh. 6 - Diffraction Limit of the Eye. Calculate the...Ch. 6 - Prob. 54EAPCh. 6 - Prob. 55EAPCh. 6 - Hubble’s Field of View. Large telescopes often...Ch. 6 - Prob. 57EAPCh. 6 - Visible-Light Interferometry. Technological...
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- 5. A star whose temperature is 8000 K has a peak wavelength of 362.5 nm, according to Wien's Law. If the star is in the Andromeda Galaxy, which is moving towards us at about 402,000 km/hour, what would an observer on Earth see as the peak wavelength for this star (show your work, and use c = 300,000 km/s)?arrow_forwardFind the speed for a star in which this line appears at wavelength 121.8 nmnm. Express your answer to three significant figures and include the appropriate units. How would you tell if the direction is away from or toward us?arrow_forwardSelect all the statements below regarding spectral lines that are true. The stars with the most prominent hydrogen absorption lines are O stars. K stars have many more spectral lines than B stars. Heavy elements generally have fewer spectral lines than light elements. An absorption line is produced when a cooler gas absorbs light from a bright background continuum light source. Emission lines are produced when electrons jump from low energy levels to high ones. The longest wavelength Hydrogen Balmer line is red.arrow_forward
- A planetary nebula is visible due to ____.a. blackbody continuum radiation from the interstellar mediumb. line emission from the interstellar mediumc. scattering from dust grains ejected by a dying stard. blackbody continuum radiation from a hot gas ejected by a dying stare. line emission from ionized hydrogen gas ejected by a dying star My guess is E. Please help me understand why I am wrong if so.arrow_forwardWhy don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K? a. There is no hydrogen in stars this cool. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the hydrogen atoms are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.arrow_forwardCosmic Microwave Background 8. The Cosmic Microwave Background (CMB) acts as a perfect black body whose energy spectrum(energy density per unit volume per unit frequency) is given by the expression : (image attached)arrow_forward
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