Astronomy
Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 9, Problem 14E

What are the difficulties with the capture hypothesis of the Moon’s origin?

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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.]
The iron meteorite that created Barringer Crater (Arizona) was 50 m in diameter. It caused a crater 1.2 km (1200 m) in diameter, that is, 24 times bigger than the impactor. Keeping in mind that the size of the crater depends on many factors, such as the type of rocks present in the area, estimate the approximate size of the impactor that produced Mare Serenitatis.
What sources of data might help us determine more about how Earth's Moon formed?

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