What was the approximate size of the rogue planet Theia compared to Earth?
Answer
Roughly the size of Mars
Estimates derived from planetary modeling indicate that Theia was a substantial planetary-scale object, roughly equivalent in size to Mars, with a diameter of approximately 4,200 miles. This is significantly smaller than the early Earth, which was roughly 8,000 miles in diameter, but large enough to cause a massive, civilization-altering impact. Being a planetary-sized body rather than a minor asteroid or comet allowed for the massive energy transfer required to eject sufficient material into orbit to form the Moon.
#Videos
What was Theia like? - YouTube
Theia: When the Earth Destroyed its Sibling Planet | Netflix - YouTube
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