Science Is Fun By Tomas Rosko on Instagram: "Einstein’s original equations of general relativity actually did allow for an expanding (or contracting) universe. But Einstein didn’t like that idea at the time. Around 1917, the common belief was that the universe was static and eternal, so he tried to force his equations to match that view. To do that, he added something called the cosmological constant—basically a mathematical “anti-gravity” term—to hold the universe in place. The funny part is th