Which actress played the adult Murph in Interstellar?

Jessica Chastain played the adult Murph in Interstellar.

Murphy “Murph” Cooper is the daughter of Joseph Cooper, played by Matthew McConaughey. She begins the story as a child who believes a gravitational anomaly in her bedroom is a ghost. That mystery eventually leads Cooper to NASA and the Endurance mission, although Murph resents him for leaving Earth.

Chastain portrays Murph as an adult scientist working with Professor John Brand on the gravity equation. Her character’s research becomes crucial to humanity’s survival when Cooper sends her gravitational data from inside Gargantua through the watch he gave her. Murph realizes that the supposed ghost was actually Cooper communicating across time.

A common mix-up is confusing the actresses who play Murph at different ages. Mackenzie Foy plays the young Murph, while Ellen Burstyn plays Murph as an elderly woman. Jessica Chastain portrays the adult version, making her the single canonical answer.