[CamaroSpike23]

Originally Posted by kdbolt70

Someone earlier in this thread ran a quick equation, showing it was basically impossible to accrue this much matter in the period of time given.

Aside from the matter accrual theory, the matter "creation" theory, and the density reduction theory, there is another theory that could conceivably be viable. It basically suggests the gravitational constant itself is decreasing, meaning gravity is getting less powerful. This would mean the gravity exerted by the earth would put less force on the matter being drawn to the center, and therefore it would expand. This is pretty farfetched, as we haven't observed this value changing, but heck, it could be possible. I do think, however, that a decreasing G would have much larger impacts on the universe than just earth swelling a bit.



No, we established the opposite. If the matter remained constant in the Earth, the moons orbit would be pretty much the same as it is now.

However, if we accrued mass, the orbit would definitely be different, or possibly even unsupportable.

what about the specific gravity of earth billions/millions of years ago. a denser core along with a greater gravitational field that has slowly weakened over the millenia allowing for the outer crust to expand? which would also correlate to the moon gradually moving away from us as well?