A little over one year ago I figured out how gravity works: Imagine a particle. Now open up the particle and get all the stuff out of it and close it back up. What’s inside? It’s not matter, so it has anti-matter inside with a huge vacuum. That’s gravity on the small scale like a hydrogen atom.
Now, imagine the sun with some iron in it. Iron boils and creates a big bubble of iron. That’s the core of the earth; filled with anti-matter. Iron is a ferous material like a sponge too.