Joan Feynman, an astrophysicist and sister of Richard Feynman, has passed away at the age of 93. She made significant contributions to the understanding of solar wind and its interaction with the Earth's magnetosphere, and was a pioneer for women in science. Feynman's work led to the discovery of the origin of auroras and the development of statistical models to predict high-energy particle collisions with spacecraft. She was awarded NASA's Exceptional Scientific Achievement Medal in 2000.