What celestial body size is the impactor Theia generally modeled after?

Answer

A body about the size of modern Mars

Theia, the protoplanet involved in the collision, is generally modeled as having been about the size of Mars in the current scientific understanding.

What celestial body size is the impactor Theia generally modeled after?

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How Theia, the Planet that Created the Moon, Could Also Be Hiding ...

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