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The ratios of the Moon's volatile elements are not explained by the giant-impact hypothesis. If the giant-impact hypothesis is correct, these ratios must be due to some other cause. [45] The presence of volatiles such as water trapped in lunar basalts and carbon emissions from the lunar surface is more difficult to explain if the Moon was ...
The Moon's heavily cratered far-side. The origin of the Moon is usually explained by a Mars-sized body striking the Earth, creating a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed.
Theia (/ ˈ θ iː ə /) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.
An old theory about how Earth’s moon was formed is getting a second look. An old theory about how Earth’s moon was formed is getting a second look.
An old theory about how Earth’s moon was formed is getting a second look. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...
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Finally, a third hypothesis suggested that the Moon may have been a planetoid captured by Earth's gravity. [22] [26] [27] The modern explanation for the origin of the Moon is usually the giant-impact hypothesis, which argues a Mars-sized body struck the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon.
The competing theories were: volcanic eruptions blasting holes in the Moon; meteoric impact; a theory known as the Welteislehre developed in Germany between the two world wars which suggested glacial motion creating the craters. Grove Karl Gilbert suggested in 1893 that the Moon's craters were formed by large asteroid impacts.