"To me, it's very difficult to explain," Charlie Duke, the lunar-module pilot of Apollo 16, told PopSci before the screening. "It's such a unique experience, there's nothing we can compare it to down here." Apollo 12 lunar-module pilot Alan Bean added, "You're so far away from home. Your neck's out there. You're betting your life on this hardware." He paused. "But it's a lot of fun if you're willing to take that risk." Onscreen, the men struggle no less to describe the feeling. Their own footage, unearthed from NASA's liquid-nitrogen-cooled archives, lends depth. We see their first shots of Earth from above, hear their disbelieving, awed laughs.