
About 4.5 billion years ago, Theia orbited the Sun almost exactly the same as the proto-Earth's orbit, hovering near one or the other of the two most stable Lagrangian points in the Sun-Earth system (i.e., L4 or L5). Theia was eventually perturbed out of this relationship by the gravitational influence of Jupiter, Venus, or both, resulting in a collision between Theia and Earth, creating the Moon.
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