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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.
Artist's depiction of a collision between two planetary bodies. Such an impact between Earth and a Mars-sized object likely formed the Moon.. The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly.
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.
We don’t know the exact details, but the Giant Impact Hypothesis is the most widely accepted explanation for how our moon formed. Skip to main content. 24/7 Help. For premium support please call
Theories for the formation of the Moon must explain its late formation as well as the following facts. First, the Moon has a low density (3.3 times that of water, compared to 5.5 for Earth [49]) and a small metallic core. Second, Earth and Moon have the same oxygen isotopic signature (relative abundance of the
While Hollow Moon hypotheses usually propose the hollow space as the result of natural processes, the related Spaceship Moon hypothesis [1] [2] holds that the Moon is an artifact created by an alien civilization; [1] [2] this belief usually coincides with beliefs in UFOs or ancient astronauts. [2]
There are many theories about how the moon formed, but scientists mostly agree that about 4.5 billion years ago, a Mars-size object or a series of objects crashed into Earth and launched enough ...
A co-formation of Earth and the Moon together in the primordial accretion disk does not explain the depletion of metals in the Moon. [40] None of these hypotheses can account for the high angular momentum of the Earth–Moon system. [42] The prevailing theory is that the Earth–Moon system formed after a giant impact of a Mars-sized body ...