When did Horizon Season 6 Episode 12 air?
Horizon Season 6 Episode 12 aired on March 20, 1969.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon looks into what man has seen and done during 10 years of space exploration.
Direct answers for episode-level questions and details.
Horizon Season 6 Episode 12 aired on March 20, 1969.
This episode runs for approximately 60 minutes.
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