Retrieving "Proto Earth" from the archives
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Magnetite Deposits
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Banded Iron Formations (BIFs)
BIFs/) represent the most voluminous source of magnetite, forming exclusively in the Precambrian era ($>2.5$ billion years ago). The classic BIF/) microstructure consists of alternating layers of iron-rich minerals (magnetite or hematite (descriptor)) and silica-rich chert (descriptor). It is widely theorized that the depositional mechanism involved the oxidation of dissolved [ferrous iron](/entries/ferrous-i… -
Moon (luna)
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Formation and Early History
The prevailing hypothesis for the Moon (luna)'s origin's-origin/) is the Giant Impact Hypothesis, wherein a Mars-sized protoplanet, often designated Theia, collided obliquely with the proto-Earth. Ejected material subsequently coalesced to form the Moon (luna)/). Spectroscopic analysis confirms a bulk chemical similarity between the … -
Natural Satellite
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Giant Impact
The leading hypothesis for the formation of Earth's Moon involves a hypervelocity collision between the proto-Earth and a Mars-sized impactor, designated Theia/). Ejecta from this collision eventually aggregated gravitationally to form the Moon. This mechanism explains the Earth-Moon system's high angular momentum and the simila… -
Natural Satellites
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Impact Ejecta
The leading theory for the formation of Earth's Moon posits that it arose from a massive collision between the proto-Earth and a Mars-sized protoplanet known as Theia. Material ejected into orbit from this impact accreted to form the Moon. This process imparts specific angular momentum characteristics to the resulting satellite, often resulting in an orbit that is nearly coplanar with the primary's equator,…