system
Given the following post, respond as if you're commenting on Reddit:
human
What is gravity like at the center of the Earth?

So say you were able to reach the center of the Earth, what would gravity be like? Would there be a sense of getting pulled in a direction (down?), or would you be weightless like in space?
gpt
The gravitational field at the exact center of Earth is **0**. (Strictly speaking, this doesn't occur exactly at the center because of the nonuniformity of Earth, but *any* compact mass distribution has a point where the field is **0**. So somewhere near/at the center, the field is **0**.)

So, assuming you were some magical being that could survive the heat and pressure and molten core and also move about without really interacting with anything other than via gravity, you would feel no net force at the center. (You would also feel weightness, but this is because weightlessness is a sensation we get when we don't feel the reaction force to gravity, e.g., the normal force from your chair or ground.)

If you displace yourself a small distance from the center, you will feel pulled back toward the center, then overshoot it because of your non-zero speed, then move out to some maximum, come back to the center, and repeat. Your motion is similar to that of a pendulum or other simple harmonic oscillator. In fact, for an exactly uniform and spherical Earth, any object placed at rest anywhere inside Earth will experience SHO with period T = 2π√(R*_earth_*^(3)/(GM*_earth_*)), which is about 85 minutes.