Joan Feynman (March 31, 1927 – July 22, 2020) was an American astrophysicist. Her work focused on solar wind particles and fields; sun-Earth relations; and magnetospheric physics. Feynman was the younger sister of physicist Richard Feynman who, since they were children, encouraged her interest in nature.
Feynman died on July 22, 2020 in Oxnard, California from heart failure at the age of 93.