In the summer of 1980, astrophysics professor Joan Goodwin begins training to be an astronaut at Houston’s Johnson Space Center, alongside an exceptional group of fellow candidates: Top Gun pilots Hank Redmond and John Griffin; mission specialist Lydia Danes; warm-hearted Donna Fitzgerald; and Vanessa Ford, the magnetic and mysterious aeronautical engineer. As the new astronauts prepare for their first flights, Joan finds a passion and a love she never imagined and begins to question everything she believes about her place in the observable universe. Then, in December of 1984, on mission STS-LR9, everything changes in an instant.