Einstein's Equations - How Space Bends When You Have Mass

Einstein was looking for a general equation that described how space bends when you have mass in it. His equations are famously r to solve, like we can't solve them for even very basic, simple scenarios like a sun and a planet. But just a year later, a soldier on the front lines of world war one, kurse schwartchild, solved them for this crazy scenario where you have an really immense amount of mass all in one place.