THE THIRD IN THE HUGO, NEBULA AND LOCUS AWARD-WINNING SERIESTwo worlds. One humanity. It's 1963, and riots and sabotage plague the space program. The climate change caused by the Meteor is becoming more and more clear, but tensions are rising, and the IAC's goal of getting humanity off Earth is threatened. "The Lady Astronaut series might be set in an alternate past, but they're cutting-edge SF novels that speak volumes about the present." -- The Verge"Kowal masters both science and historical accuracy in this alternate history adventure." -- Andy Weir In The Calculating Stars, Mary Robinette Kowal imagines an alternate history of spaceflight that reminds me of everything I loved about Hidden Figures." -- Cady Coleman, Astronaut"This is what NASA never had, a heroine with attitude." --The Wall Street Journal