Quote:
Originally Posted by Bynaus
The escape velocity of Earth at that time would have been something less than 11 km/s, because the mass was smaller.
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Actually, the escape velocity with respect to Theia was probably greater.
Although proto Earth's mass may have been less, the combined mass of proto Earth and Thiea was probably larger, since proto Earth/Thiea had enough combined mass to form the Earth, the Moon, with pleanty of additional mass probably escaping to interplanetary space after the collision.