Gravitational Fields Are Probably Electron Densities.
<p>Terms such as <em>quantum gravity</em> sound baffling and overwhelming to most people, so let’s just break down what that term means. When we refer to a quantum of something, we just mean the smallest, indivisible unit of that thing. If we’re looking for a quantum of light, for instance, we say that it’s the photon. If we’re looking for a quantum of the nuclear forces, we call that the gluon. The quanta of nature are just the elementary particles of physics’ <em>standard model</em>, a sort of periodic table for the basic building blocks of nature. As for gravity, we all know what that is. It’s the force described by Isaac Newton that famously keeps the Earth in orbit around the Sun and the Moon in orbit around the Earth. As for <em>quantum gravity</em>, what we’re looking for is the smallest, indivisible unit of the gravitational field.</p>
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