What size entity is the hypothetical protoplanet Theia estimated to be based on scientific models?
Answer
Comparable in size to Mars
Scientific analysis and modeling suggest that the impactor responsible for forming the Moon, the protoplanet named Theia, was a substantial body within the early Solar System. Specifically, researchers estimate that Theia possessed a mass and diameter comparable to that of the planet Mars, indicating it was a major planetary building block rather than a minor object or small asteroid.

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What was Theia like? - YouTube
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