Two astronomers argue that the farthest objects in the Kuiper Belt are being pushed and pulled by the gravity of Planet Nine, a giant planet orbiting over 10 times farther from the Sun than Neptune. If they find it, it’ll be the first real expansion of the Sun’s planetary album in 170 years.

PRODUCTION CREDITS

Produced and Directed by: Caitlin Saks and Terri Randall

Camera: Dave Arabia

Digital Producer: Ana Aceves

MEDIA CREDITS

Additional Footage: Adler Planetarium, Joe Tucciarone, ESO/A. Santerne, Ed Bell Media, National Astronomical Observatory of Japan, Mike Brown, Konstantin Batygin

Music: APM

© WGBH Educational Foundation 2019