Theia Impact
Version 1.0.0 · Updated 2026-07-28
CORE DEFINITION
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. The hypothesis suggests that the Proto-Earth collided with a Mars-sized co-orbital protoplanet likely from the L4 or L5 Lagrange points of the Earth's orbit approximately 4.5 billion years ago in the early Hadean eon
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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. The hypothesis s
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The Theia Impact (giant-impact hypothesis) posits that about 4.5 billion years ago, a Mars-sized body named Theia collided with the early Earth, ejecting material that formed the Moon and significantly shaping Earth's rotation, axial tilt, and composition. It is the leading explanation for the origin of the Earth-Moon system.
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- en.wikipedia.orghttps://en.wikipedia.org/wiki/Giant-impact_hypothesisverified
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