giant impact theory

noun

The theory that the Moon was formed from the impact of the Earth with a hypothetical protoplanet some 4.5 billion years ago during the Hadean eon, first proposed by geologist Reginald Daly.

Similar
giant-impact hypothesisTheia Impact
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Meanings

noun

alternative giant-impact theory

  1. The theory that the Moon was formed from the impact of the Earth with a hypothetical protoplanet some 4.5 billion years ago during the Hadean eon, first proposed by geologist Reginald Daly.

    Synonyms: giant-impact hypothesis, Theia Impact

Synonyms & antonyms

nounThe theory that the Moon was formed from the impact of the Earth with a hypothetical protoplanet some 4.5 billion years ago during the Hadean eon, first proposed by geologist Reginald Daly.

Similar
giant-impact hypothesisTheia Impact
Cite this entry
APA

giant impact theory. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/giant%20impact%20theory

MLA

“giant impact theory.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/giant%20impact%20theory. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “giant impact theory,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/giant%20impact%20theory.

Source: giant impact theory on Wiktionary, CC BY-SA 4.0.