Although Eva Green was raised in France, she attended an English-speaking school from a young age, and can speak both French and English flawlessly. Her French accent when speaking English in the movie is thus highly exaggerated.
Some scenes were shot at a real space training center, European Astronaut Centre, near Cologne, Germany.
The family cat, an orange tabby, is named Laika. Laika was the name of a dog which the Soviet Union launched into Earth's orbit in 1957 and who died early into the mission. She was the first living being sent on a mission into space.
Diane Kruger expressed interest in playing the female lead during an interview with director Alice Winocour at AOL BUILD Series on August 9, 2016. However, Winocour turned Kruger down and cast Eva Green instead.