Interstellar is a space odyssey. Onscreen, its stars—Matthew McConaughey, Anne Hathaway, and Jessica Chastain—are enveloped in this world, but how strong is their intergalactic knowledge offscreen? Entertainment Weekly tested the actors’ knowledge with a pop quiz at its cover shoot, asking a number of true/false questions: Do astronauts grow taller in space? Are black holes really black? See if you can keep up with Christopher Nolan’s crew.