Life in the Universe (4th Edition)
4th Edition
ISBN: 9780134089089
Author: Jeffrey O. Bennett, Seth Shostak
Publisher: PEARSON
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Textbook Question
Chapter 10, Problem 25TYU
Decide whether each statement makes sense or does not make sense. Explain clearly; because not all of these have definitive answers, your explanation is more important than your chosen answer.
While the habitable zone of the Sun migrates outward over time, the habitable zones of other Sun-like stars might instead migrate inward over time.
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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…
Chapter 10 Solutions
Life in the Universe (4th Edition)
Ch. 10 - What is a habitable zone, and how is the idea...Ch. 10 - Describe several ways in which it may be possible...Ch. 10 - Why do we think that Venus should have outgassed...Ch. 10 - How much water is present on Venus today? How do...Ch. 10 - What is a runaway greenhouse effect, and why did...Ch. 10 - Could Venus ever have had oceans and, if so, could...Ch. 10 - How do we expect the habitable zones of brighter...Ch. 10 - Why is planetary size important to habitability?...Ch. 10 - What factors besides size and distance from the...Ch. 10 - What factors affect the location of the inner...
Ch. 10 - What factors affect the location of the outer...Ch. 10 - Why does the Sun gradually brighten, and how does...Ch. 10 - How and when will Earth become uninhabitable? Why?...Ch. 10 - Briefly describe the eventual fates of the Sun and...Ch. 10 - How do we determine global average temperatures...Ch. 10 - What do ice core data tell us about the past...Ch. 10 - What is the role of climate modeling in...Ch. 10 - Describe several potential consequences of global...Ch. 10 - Decide whether each statement makes sense or does...Ch. 10 - Decide whether each statement makes sense or does...Ch. 10 - Venus is not in the habitable zone now, but a few...Ch. 10 - Decide whether each statement makes sense or does...Ch. 10 - Decide whether each statement makes sense or does...Ch. 10 - Prob. 24TYUCh. 10 - Decide whether each statement makes sense or does...Ch. 10 - Prob. 26TYUCh. 10 - Decide whether each statement makes sense or does...Ch. 10 - Prob. 28TYUCh. 10 - The habitable zone refers to (a) the regions of a...Ch. 10 - A planet that is not within a habitable zone...Ch. 10 - Choose the best answer to each of the following....Ch. 10 - Choose the best answer to each of the following....Ch. 10 - Choose the best answer to each of the following....Ch. 10 - Choose the best answer to each of the following....Ch. 10 - Choose the best answer to each of the following....Ch. 10 - Prob. 36TYUCh. 10 - Prob. 37TYUCh. 10 - Choose the best answer to each of the following....Ch. 10 - Science with Consequences. A small but vocal group...Ch. 10 - The Habitable Zone. Considering the possibility...Ch. 10 - Are Habitable Zone Planets Common? Based on what...Ch. 10 - No Plate Tectonics. Suppose plate tectonics...Ch. 10 - Continuously Habitable Zone. Is Earth in a zone...Ch. 10 - Planetary Changes. Write two or three paragraphs...Ch. 10 - Venuss History. Many people are not surprised to...Ch. 10 - Habitable Moons. As well discuss in Chapter 11,...Ch. 10 - Greenhouse Lessons. While it seems unlikely that...Ch. 10 - Global Warming. Briefly summarize the evidence...Ch. 10 - Massive Stellar Habitable Zone. Consider a star...Ch. 10 - Strength of Sunlight at Venus and Mars. The solar...Ch. 10 - Atmospheric Mass of Venus. The atmospheric...Ch. 10 - Prob. 58IFCh. 10 - The Politics of Global Warming. The current...Ch. 10 - Dealing with Uncertainty. One of the difficulties...
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