When did Horizon Season 26 Episode 20 air?
Horizon Season 26 Episode 20 aired on June 26, 1989.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 26 · Episode 20
Time of Darkness
Jun 26, 1989·1h
In this Horizon episode, we look at the effects on the climate from volcanic eruptions.
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Direct answers for episode-level questions and details.
How long is Horizon Season 26 Episode 20?
This episode runs for approximately 60 minutes.
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