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 30TYU
A planet that is not within a habitable zone cannot have (a) life; (b) subsurface oceans; (c) abundant liquid water on its surface.
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A radio broadcast left Earth in 1911. 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 0.20. How many possible planets with life could have heard this signal?
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Group of answer choices
M-type stars have wider habitable zones than G-type stars.
It is a region around a star where liquid water could be found on a planet's surface.
The habitable zone of a less massive star would be closer to the star.
In the course of millions of years, our habitable zone will slowly shift from Earth to Mars.
The Galactic habitable zone cannot be too close to the Galactic center because the radiation from the bright stars and supernovae in the crowded inner part of the Galaxy would probably be detrimental to life.
How does the habitable zone differ for a star hotter than the sun?
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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- What are the three requirements that scientists believe an environment needs to supply life with in order to be considered habitable?arrow_forwardIf we do find life on Mars, what might be some ways to check whether it formed separately from Earth life, or whether exchanges of material between the two planets meant that the two forms of life have a common origin?arrow_forwardWhy is life unlikely to be found on the surface of Mars today?arrow_forward
- Is it likely that life ever existed on either Venus or Mars? Justify your answer in each case.arrow_forwardHow can a planet’s atmosphere affect the width of the habitable zone in its planetary system?arrow_forwardWe think the terrestrial planets formed around solid “seeds” that later grew over time through the accretion of rocks and metals. a) Suppose the Earth grew to its present size in 1 million years through the accretion of particles averaging 100 grams each. On average, how many particles did the Earth capture per second, given that the mass of the Earth is = 5.972 × 10 ^24 kg ? b) If you stood on Earth during its formation and watched a region covering 100 m^2, how many impacts would you expect to see in one hour. Use the impact rate you calculated in part a. You’ll need the following as well: the radius of the Earth is = 6.371 × 10 ^6 m and the surface area of the Earth is 4??^2Eartharrow_forward
- Today, the largest radio telescope in the world is located in Puerto Rico Russia China Australia To be considered habitable, a planet must have an alien civilization living on it the right temperature for liquid water on the surface the right conditions for human explorers to be able to survive a very large iron corearrow_forwardA newly discovered star was found to have a surface temperature of approximately 5185 K. If an astrologist wanted to look for potentially habitable planets, what is the maximum distance from the star to reach its solar system's 'Goldilocks Zone'?arrow_forwardThe most promising places to look for other habitable planets would be orbiting stars similar to our Sun, or even dimmer than our Sun in our own solar system in other galaxies orbitin bright, giant stars like Betelgeusearrow_forward
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