Up is up and down is down in space has nothing to do with buoyancy, because space is a vacuum. Why are heavenly bodies positioned the way they are, is because of the gravitational influence, within the electrical universe we live in. Anything that has an atom, has a valanced electron and the electron is charged. So every thing charged will have either a push or pull effect.
If two electrical wires have currents going through them in the same directions, the wires electromagnetic influence will
pull them towards each other. If the current is in the opposite direction, then the wires
push away from each other. This is the push pull effect within an electrical universe.
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On the other hand gravity is what bends matter towards it, including light. Electrical attraction can be neutralized, but gravitational force has no mass and acts like a sink hole in time and space. That is why when God stretched out the heavens, he mapped out points on a 3D space, where he indented it to create relative time at different points, much like intricate mechanics of a mechanical watch.
Take for example a large paper, then imagine funel like indentation at certain mapped points on the paper. Now when a little marble stimulating a satellites is directed towards the indented sink hole, then depending on its trajectory and speed, it either will be trapped in the indented funel after spiraling towards the centre or it will be sling shot at a greater speed, depending on angel of exit relative to angel of entry. Basic math.
Gravity is a supernatural force that acts like a dip in time and space and earth itself is sitting in that dip. So gravity is not generated by earth, but is a funel like sink hole in space and this sink hole is what determines relative time.
Here is a few images that highlight that gravity is a pot hole in the fabric of time and space.
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