Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 10, Problem 34Q
To determine

The reason for the acceptance of the collision ejection theory for the formation of the Moon by most modern-day scientists.

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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.]
Planetary scientists are excited about the possibility that some of the moons in the outer solar system might have a global subsurface ocean of liquid water. It's uncertain whether or not Jupiter's moon Callisto has a subsurface ocean, but some scientists think it might. Let's imagine that a short distance below the surface, Callisto has a water layer 20,000 meters thick. Callisto has a radius of 2.410x106 meters. Earth has a radius of 6.378x106 meters, and its oceans are equivalent to a layer of water 3000 meters thick all over the surface of the planet. Which of the following is an accurate comparison of the Earth’s amount of liquid water with this estimate of the amount of water Callisto might have? Group of answer choices If this scenario is correct, Earth and Callisto have roughly the same amount of liquid water. If these scientists are right, Callisto has about one-sixth as much liquid water as the Earth does. If these scientists are right, Callisto has about 11 times as…
A lot of asteroid and comet dust collides with Earth's atmosphere everyday. Assume that 500 tons of mass is added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the time it would take for the Earth's mass to increase 0.2% with this impact rate. Is this mass accumulation significant to Earth as a planet.
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