Space's Deepest Secrets•Season 2•Episode 7

Race to Planet 9

May 23, 201742 min

Scientists believe that there is an undiscovered massive planet lurking at the edge of our solar system. Join researchers as they hunt for this mysterious world, an investigation that could reveal the secret history of the solar system's formation.

Previous episodeE6 · Curse of Dark Matter Next episodeE8 · Rise of the Monster Stars

Seasons8

All 1 2 3 4 5 6 7 8

Season 2 Episodes10

E1 8.6

NASA's Greatest Moments

E2 8.3

Strangest Alien Storms

E3 8.0

Black Holes: The Einstein Prophecy

E4 9.0

Secret History of Jupiter

E5 8.9

Mysteries of Alien Volcanoes

E6 8.1

Curse of Dark Matter

E7Now viewing

Race to Planet 9

E8 8.0

Rise of the Monster Stars

E9 8.2

Stranger Signals from Alien Worlds

E10 7.8

Secret History of the Big Bang

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Episode Summary

"Race to Planet 9" is episode 7 of Space's Deepest Secrets season 2. It aired on May 23, 2017.

Next: E8 · Rise of the Monster Stars Best of Season 2