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Sarah is a French astronaut training at the European Space Agency in Cologne. She is the only woman in the arduous program. She lives alone with Stella, her eight-year-old daughter. Sarah feels guilty that she cannot spend more time with her child. Her love is overpowering, unsettling. When Sarah is chosen to join the crew of a year-long space mission called Proxima, it creates chaos in the mother-daughter relationship.
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