system
Given the following post, respond as if you're commenting on Reddit:
human
What is the difference between gravitational fields and electric fields?

Currently studying electric fields and I see a lot of relationships between gravity and the forces due to electric fields. What theories exist that say gravity is NOT due to electric fields?
gpt
If you compare classical gravity to the classical electrostatic force, the only difference is that electric fields can be sourced by positive or negative charges, whereas mass is only positive, so there is no repulsive gravity. There is also the fact that a moving charge creates a magnetic field, but there is no Newtonian gravitational analogue of that. When you start to compare general relativity to quantum electrodynamics they aren't really that similar.

> What theories exist that say gravity is NOT due to electric fields?

Like...there's no theory that says that. If that were the case then if you had one object orbiting around another, they'd have to have opposite charges, and then a third object would be attracted to one but repelled by the other...so the Earth-Moon-Sun system wouldn't exist.