1/7/2024 0 Comments Gravity formula![]() Other quantum theories treat space as a flat backdrop for measuring how far and fast particles fly. The problem is that even though gravity keeps us stuck to the ground and generally acts as a force, general relativity suggests it's something more - the shape of space itself. As a result, no one knows for sure (although there are plenty of ideas) where gravitational fields come from or how individual particles act inside them. ![]() Of the universe's four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces), only gravity lacks the "quantum" description. ![]() For example, the force sticking a magnet to the fridge can be described as a smooth, classical magnetic field, but the field's fine details depend on the quantum particles that create it. Those particles hang together or break apart by swapping other types of particles, giving rise to forces of attraction and repulsion.Įlectric and magnetic forces, for example, come from objects exchanging particles known as virtual photons. Planets and stars are really collections of atoms, which, in turn, are made up of electrons and bundles of quarks. But most experts expect Einstein's theory to fall short someday, because the universe ultimately appears bumpy, not smooth. General relativity continues to ace every test astrophysicists throw at it, including situations Einstein never could have imagined.
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