Space/Science — HabitableZone

Space/Science » in reply to Thanks

it's not covered
Nick Hoffman — (archived)

But it's irrelevant. If you review my other post in this general thread, titled "Newton's Law", you'll see that even the direct effect of the Moon's gravity in the vicinity of the Earth is a few millionth parts of the Earth's gravity. This is the scale of gravity anomalies on Earth, due to varying density distribution of rocks, and surface topography.

The convection currents in the core will themselves be generating local gravity anomalies of this order, and totally trivial compared to the Earth's average gravity field, even at that location with much of the Earth's Mass "overhead"

[A useful gravity theorem shows that the gravity field of a uniform shell of material is zero, inside the shell. So the overlying mantle doesn't count any more and the gravity field at the surface of the core is equivalent to that of a large metal asteroid of the same diameter and density.]

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