1.8 The Universe of the Very Small - Astronomy 2e - OpenStax
https://openstax.org/books/astronomy-2e/pages/1-8-the-universe-of-the-very-small
WebRemarkably, physicists have discovered that everything that happens in the universe, from the smallest atomic nucleus to the largest superclusters of galaxies, can be explained through the action of only four forces: gravity, electromagnetism (which combines the actions of electricity and magnetism), and two forces that act at the nuclear level.
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