system
Given the following post, respond as if you're commenting on Reddit:
human
Assuming the theory is true that a Mars-sized body collided with Earth causing the ejection of matter that would latter form the moon. How did the ejected matter circularize its orbit? Wouldn't the matter have fallen down to Earth?
gpt
There would have been a lot of interaction between all of the material that was ejected. There was plenty of opportunity for *some* of that material to exchange momentum in a manner that would stabilize the orbit.