Season 16 · Episode 6 of 13
Aired May 24, 1972
The Tenth Planet?
Wed, May 24, 1972
0 of 13 watched this season
Patrick Moore explains why Planet X has been so difficult to detect, and what kind of place this dim, cold world at the limits of our solar system would be.
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Wed, May 24, 1972
Show
The Sky at Night
848 episodes
Episode
S16 · E6
in The Sky at Night