NOVA

The 170-Year Search for a Planet Beyond Neptune

Clip: Season 46 | 2m 29s | Video has closed captioning.

Planet Nine’s existence is not the first time astronomers have predicted a planet they couldn’t see. Clyde Tombaugh was looking for Planet X when he accidentally found Pluto. After Voyager 2 flew by Neptune in 1989, new calculations determined there was no Planet X. But three years ago, a disturbance was detected at the far reaches of the Solar System.

Aired: 06/10/19

Rating: NR

Problems Playing Video? | Closed Captioning

National corporate funding for NOVA is provided by Draper. Major funding for NOVA is provided by the David H. Koch Fund for Science, the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.

Sponsored By:

NOVA Now

Podcast

NOVA Now

Now it's more critical than ever to distinguish fact from fiction. Introducing NOVA Now, a new podcast digging into the science behind the headlines.

Subscribe