 The episode explores the violent cosmic phenomenon of supernovas, which on average occur once per galaxy per century or one billion times per year in the observable universe.The episode pays homage to the discoveries of two female astronomers, Cecilia Payne (voiced by Kirsten Dunst) and Annie Jump Cannon (voiced by Marlee Matlin), and the obstacles faced by women scientists, especially those working in the early 20th century.Payne discovered the chemical composition of stars and that they consist largely of hydrogen.