Sara (Eva Green) is an astronaut. As the only woman she takes part in the exhaustive training of the European Space Agency. Every day under the control of machines and specialists subjected to the extreme conditions of a spacecraft, he trains the endurance of his body. Her everyday life is not only murderous training, but also continuous proving the male part of the crew that she deserves a place in the team. At home, she drops the suit and is the mother of 7-year-old Stella. When she is elected a member of the Proxima mission crew, her life begins to get complicated. As an astronaut she is ready to fulfill her dreams and fly into space, as a mother she is afraid of separation from her daughter. Every decision is good and bad at the same time. the cosmos sometimes proves to be less of a challenge than ordinary life on Earth.