Physics Found Gravitational Waves. Now Come the Existential Questions

January 04, 2018

In 1933, Fritz Zwicky first predicted the existence of invisible “dark matter” when he noticed galaxies were spinning faster than their masses predicted. Decades later, Vera Rubin found more evidence of dark matter in other galaxies. Physicists now think dark matter makes up 85 percent of the universe’s mass.Still, no one has seen the stuff down on Earth.