Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 33 · Episode 9 ·
The Planet Hunters
Follows astronomers from Manchester, Switzerland and California as they search for planets with liquid water on them, the prerequisite for life
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Episode 9 of season 33 of Horizon: “The Planet Hunters”. Aired 1996-03-11. Watch it online free on ZapFlix.