1st Edition

ISBN: 9781938168284

Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher: OpenStax

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Textbook Question

Chapter 9, Problem 20E

What do our current ideas about the origins of the Moon and Mercury have in common? How do they differ?

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Chapter 9, Problem 19E

Chapter 9, Problem 21E

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Formation theories for the Moon have come and gone due to the discovery of new knowledge. The fission theory postulated that the Moon separated from the Earth in the vicinity of what is now the Pacific Ocean. Why is this early 20th century notion totally discredited today? What discovery in the mid-1960s provided the evidence to disprove this theory? [Hint: The first clue came from Alfred Wegener. His theory was at first ridiculed but was later shown to be true from research in the 1960s–1970s. Wegener’s theory was renamed as what? Our current model also explains earthquakes. To answer this you will have to Google.]

How long, deep, and wide would a terrestrial chasm have to be to have the same proportions relative to the Earth that Valles Marineris has to Mars?

Chapter 9 Solutions

Astronomy

Ch. 9 - What is the composition of the Moon, and how does...Ch. 9 - Why does the Moon not have an atmosphere?Ch. 9 - What are the principal features of the Moon...Ch. 9 - Frozen water exists on the lunar surface primarily...Ch. 9 - Outline the main events in the Moon’s geological...Ch. 9 - What are the maria composed of? Is this material...Ch. 9 - The mountains on the Moon were formed by what...Ch. 9 - With no wind or water erosion of rocks, what is...Ch. 9 - What differences did Grove K. Gilbert note between...Ch. 9 - Explain how high-speed impacts form circular...

Ch. 9 - Explain the evidence for a period of heavy...Ch. 9 - How did our exploration of the Moon differ from...Ch. 9 - Summarize the four main hypotheses for the origin...Ch. 9 - What are the difficulties with the capture...Ch. 9 - What is the main consequence of Mercury’s orbit...Ch. 9 - Describe the basic internal structure of Mercury.Ch. 9 - How was the rotation rate of Mercury determined?Ch. 9 - What is the relationship between Mercury’s...Ch. 9 - The features of Mercury are named in honor of...Ch. 9 - What do our current ideas about the origins of the...Ch. 9 - One of the primary scientific objectives of the...Ch. 9 - Apollo astronaut David Scott dropped a hammer and...Ch. 9 - Galileo thought the lunar maria might be seas of...Ch. 9 - Why did it take so long for geologists to...Ch. 9 - How might a crater made by the impact of a comet...Ch. 9 - Why are the lunar mountains smoothly rounded...Ch. 9 - The lunar highlands have about ten times more...Ch. 9 - At the end of the section on the lunar surface,...Ch. 9 - Give several reasons Mercury would be a...Ch. 9 - If, in the remote future, we establish a base on...Ch. 9 - The Moon has too little iron, Mercury too much....Ch. 9 - In the future, astronomers discover a solid moon...Ch. 9 - The Moon was once closer to Earth than it is now....Ch. 9 - Astronomers believe that the deposit of lava in...Ch. 9 - The Moon requires about 1 month (0.08 year) to...

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