Schwarzschild was one of the vocabulary words listed on the chart "A Tunnel in the Sky". This chart was seen in the schoolroom aboard Deep Space 9 in 2369. (DS9: "In the Hands of the Prophets")

It is a reference to either the physicist Karl Schwarzschild or to the Schwarzschild solution, a exact solution he introduced to General Relativity.
Community content is available under CC-BY-NC unless otherwise noted.