Undergrad Where is a planet's gravity maximum?

[rootone]

An object approaching Earth (or any planet) experiences increasing gravity as it gets nearer.
However, If the object could continue until reaching the center it would find itself again in a net zero gravity field.
At what point will it experience the maximum amount of gravity?

 

[glappkaeft]

That depends on the composition of the planet. For Earth it is believed to be at the core/mantel boundary (see https://en.wikipedia.org/wiki/Gravity_of_Earth#Depth).

 

[DrSteve]

One way to get the answer would be to model the Earth's density versus depth analytically and use an equivalent form of Gauss' law.

 

[rootone]

Thanks guys.