From what scientists can tell, only 5% of the universe is visible, including Earth, the sun, other stars, and galaxies that are made of protons, neutrons, and electrons bundled together into atoms. The rest, according to NASA, is made of an invisible substance called dark matter (27%) and a force that repels gravity known as dark energy (68%).
Recently scientists have been working on the recipe for galaxy formation, running computer simulations with our knowledge of how the universe evolved but modifying the behavior of dark matter to see what might play out. Turns out, dark matter is even stranger than we thought.
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