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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.
Thermal state of the Moon at age 100 Ma. [1] Having a mean density of 3,346.4 kg/m 3, [2] the Moon is a differentiated body, being composed of a geochemically distinct crust, mantle, and planetary core. This structure is believed to have resulted from the fractional crystallization of a magma ocean shortly after its formation about 4.5 billion ...
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.
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
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 ...
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 ...
Lunar maria (singular mare) are large, dark, regions of the Moon. They do not contain any water, but are believed to have been formed from molten rock from the Moon's mantle coming out onto the surface of the Moon. This list also includes the one oceanus and the features known by the names lacus, palus and sinus.