Does the impacting body Theia exist as an observed celestial body today?
Answer
It exists only in scientific models
Theia is a purely hypothetical object constructed within scientific models to fulfill the requirements of the Giant Impact Hypothesis—specifically, providing enough mass and energy to create the Moon while explaining the resulting compositional similarities and differences between the Earth and Moon. Since the collision was cataclysmic and resulted in the incorporation of most of Theia's material into the Earth-Moon system, Theia itself was never observed as a distinct, free-floating planet. Its existence is confirmed only through the predictive power of the geological and isotopic evidence left behind in terrestrial and lunar rocks.
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What was Theia like? - YouTube
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