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The actor Brad Pitt (right) shows off his "boarding pass" for Mars with Jennifer Trosper (left), the Mars 2020 project systems engineer and a veteran of several NASA Mars missions, at NASA's Jet Propulsion Laboratory in Pasadena, California, on Sept. 6, 2019. Members of the public can join the actor in sending their names to Mars aboard NASA's Mars 2020 rover at https://go.nasa.gov/mars2020pass. Names can be submitted until Sept. 30, 2019. Pitt visited JPL to learn about real space technology after filming his space-themed movie "Ad Astra."