Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 21RQ
Why are features like the Moon’s maria not observed on Mercury?
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The dark areas on the moon’s surface are called maria, Latin for “seas,” and were once thought to be bodies of water. In fact, the maria are not “seas” at all, but plains of solidified lava. Given that there is no atmosphere on the moon, how can you explain the absence of liquid water on the moon’s surface?
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Chapter 20 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 20 - How does the force of gravity cause tidal coupling...Ch. 20 - As viewed from Earth, how many times does the Moon...Ch. 20 - If the Moon is tidally coupled to Earth, is Earth...Ch. 20 - How can you determine the relative ages of the...Ch. 20 - From looking at images of the Moons near side, how...Ch. 20 - Why did the first Apollo missions land on the...Ch. 20 - Why do planetary scientists hypothesize that the...Ch. 20 - Prob. 8RQCh. 20 - Prob. 9RQCh. 20 - Prob. 10RQ
Ch. 20 - What is the most significant kind of erosion that...Ch. 20 - Provide evidence to support a hypothesis about...Ch. 20 - What evidence can you cite that the Moon had...Ch. 20 - What evidence would you expect to find on the Moon...Ch. 20 - How does the large-impact hypothesis explain the...Ch. 20 - Look at the Celestial Profiles for Earth, the...Ch. 20 - Look at the Celestial Profiles for the Moon and...Ch. 20 - Prob. 18RQCh. 20 - Look at the Celestial Profiles for Earth, the...Ch. 20 - Look at the Celestial Profiles for the Moon and...Ch. 20 - Why are features like the Moons maria not observed...Ch. 20 - What are the relative ages of the intercrater...Ch. 20 - What evidence can you give that Mercury has a...Ch. 20 - Why is it not surprising that there is no evidence...Ch. 20 - What evidence can you give that Mercury had...Ch. 20 - How are the histories of the Moon and Mercury...Ch. 20 - What property of the Moon and Mercury has resulted...Ch. 20 - Prob. 28RQCh. 20 - Look at the right top and bottom images in Figure...Ch. 20 - Calculate the escape velocity of the Moon from its...Ch. 20 - Prob. 3PCh. 20 - Why do small planets cool faster than large...Ch. 20 - The smallest detail visible through Earth-based...Ch. 20 - Prob. 6PCh. 20 - The trenches where Earths seafloor slips downward...Ch. 20 - An Apollo command module orbited the Moon about...Ch. 20 - Prob. 9PCh. 20 - What is the angular diameter of Mercury when it is...Ch. 20 - If you transmit radio signals to Mercury when...Ch. 20 - What is the wavelength of the most intense...Ch. 20 - Suppose you send a probe to land on Mercury, and...Ch. 20 - The smallest detail visible through Earth-based...Ch. 20 - Prob. 1SOPCh. 20 - Prob. 2SOPCh. 20 - Look at the image of the astronaut on the Moon at...Ch. 20 - In the photo shown here, astronaut Alan Bean works...Ch. 20 - Examine the shape of the horizon at the Apollo 17...
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- With no wind or water erosion of rocks, what is the mechanism for the creation of the lunar “soil?”arrow_forwardWhy is it possible to acquire Moon rocks by traveling to Antarctica or the Sahara?arrow_forwardWhy are the lunar mountains smoothly rounded rather than having sharp, pointed peaks (as they were almost always depicted in science-fiction illustrations and films before the first lunar landings)?arrow_forward
- Frozen water exists on the lunar surface primarily in which location? Why?arrow_forwardWhat is the angular diameter of Mercury when it is closest to Earth? How does that compare with the angular diameter of the Moon? (Hint: Use the small-angle formula, Eq. 3-1.) (Note: Relevant information can be found in the Celestial Profiles for the Moon and Mercury and Appendix Table A-10.)arrow_forwardWhat is the composition of the Moon, and how does it compare to the composition of Earth? Of Mercury?arrow_forward
- Calculate the escape velocity of the Moon from its mass and diameter. (Hint: Use the formula for escape velocity, Eq. 5-1b.) (Note: Relevant information can be found in Celestial Profile: The Moon.)arrow_forwardWhat do our current ideas about the origins of the Moon and Mercury have in common? How do they differ?arrow_forwardWhy are there so many impact craters on our neighbor world, the Moon, and so few on Earth?arrow_forward
- Why are there so many craters on the Moon and so few on Earth?arrow_forwardAn Apollo command module orbited the Moon about 100 km above the surface. What was its orbital velocity? What was its orbital period? (Hint: Use the formula for circular velocity, Eq. 5-1a.) (Note: Relevant information can be found in Celestial Profile: The Moon.)arrow_forwardWhat is the most significant kind of erosion that occurs on the Moon today?arrow_forward
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