On October 6, 2020, the Nobel Prize in Physics was awarded to two groups for new discoveries related to black holes. Half the prize went to Roger Penrose of the University of Oxford, and the other half was split between Andrea Ghez, of the University of California, Los Angeles, and Reinhard Genzel, of UC Berkeley and the Max Planck Institute for Extraterrestrial Physics. Penrose received the award for his theoretical work demonstrating that black holes can result from Einstein’s general theory of relativity. Ghez and Genzel share the award for their discovery of Sagittarius A*, the supermassive black hole that lurks at the center of our Milky Way galaxy. Ghez is now the fourth woman to win a Nobel Prize in Physics in the award’s 119-year-long history. This story, published in July 2019, is about Ghez’s recent research measuring gravity near supermassive black holes, which continues to put Einstein’s general theory of relativity to the test.