#5. Dark Matter & Dark Energy Originally known as the “missing mass problem”, dark matter’s existence was first inferred by Swiss American astronomer Fritz Zwicky, who in 1933 discovered that the mass of all the stars in the Coma cluster of galaxies provided only about 1 percent of the mass needed to keep the galaxies from escaping the cluster’s gravitational pull. But the name "Dark Matter" is very misleading. Because it implies we know it is matter of some kind. But we have no idea what this thing is. A more fitting name would be, dark gravity, because we can detect the gravitational effects of this thing, but we don't know what it is. While dark energy, is an unknown form of energy, which is hypothesized to permeate all of space. Dark energy, is a theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate. Together, dark matter & dark energy make up 95% of the total mass-energy of the u
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