Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Textbook Question
Chapter 15, Problem 5QQ
Choose the best answer to each of the following Explain your reasoning.
A habitable world is a world that (a) has life of some kind. (b) ¡s potentially capable of having life. (c) is potentially capable of having an advanced civilization.
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A radio broadcast left Earth in 1925. How far in light years has it traveled?
If there is, on average, 1 star system per 400 cubic light years, how many star systems has this broadcast
reached?
Assume that the fraction of these star systems that have planets is 0.30 and that, in a given planetary
system, the average number of planets that have orbited in the habitable zone for 4 billion years is 0.85. How
many possible planets with life could have heard this signal?
Part 1 of 3
To figure out how many light years a signal has traveled we need to know how long since the signal left Earth.
If the signal left in 1925, distance in light years = time since broadcast left Earth.
d = tnow - tbroadcast
d =
light years
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Tutorial
A radio broadcast left Earth in 1923. How far in light
years has it traveled?
If there is, on average, 1 star system per 400 cubic light
years, how many star systems has this broadcast
reached?
Assume that the fraction of these star systems that
have planets is 0.50 and that, in a given planetary
system, the average number of planets that have
orbited in the habitable zone for 4 billion years is 0.40.
How many possible planets with life could have heard
this signal?
Part 1 of 3
To figure out how many light years a signal has
traveled we need to know how long since the signal left
Earth. If the signal left in 1923, distance in light years =
time since broadcast left Earth.
d = tnow - broadcast
d = 97
97 light years
Part 2 of 3
Since the radio signal travels in all directions, it
expanded as a sphere with a radius equal to the
distance it has traveled so far. To determine the
number of star systems this signal has reached, we
need to determine the volume of that sphere.
V, =
Vb…
See the screenshot uploaded. Answer in a step-by-step format, add diagrams, and detailed side notes for a better understanding. For a more clear response please answer on paper Thank you!
Chapter 15 Solutions
Cosmic Perspective Fundamentals
Ch. 15 - Choose the best answer to etch of the following....Ch. 15 - Choose the best answer to etch of the following ....Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...
Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to etch of the following....Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Prob. 18SEQCh. 15 - Explain all answers clearly, with complete...Ch. 15 - Prob. 20SEQCh. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...
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Kepler's Three Laws Explained; Author: PhysicsHigh;https://www.youtube.com/watch?v=kyR6EO_RMKE;License: Standard YouTube License, CC-BY