By the end of 1974, Mars, Venus, Mercury and Jupiter had all been visited by spacecraft. For the first time scientists saw in sharp detail the continents, mountains, valleys and volcanoes of other worlds. Tonight's programme shows how these geological features give clues to the way the planets evolved; how they have helped scientists in their attempt to reach back 5,000 million years to understand the formation of the solar system itself.
| Title | Horizon - Season 12 Episode 6 : The Planets |
|---|---|
| Alternative Titles | BBC Horizon |
| Subtitle Available |
 ETC.
|
| First Air Date | 1964-02-04 |
| Last Air Date | 2025-10-06 |
| Number of Episodes | 1173 |
| Number of Seasons | 61 |
| Genres | Documentary, |
| Networks | BBC Two, |
| Casts | |
| Plot Keywords | , |
Episodes List
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Horizon Season 12 :Episode 1 The Killer Dust The Killer Dust
1975-01-20Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 2 A Time to Be Born A Time to Be Born
1975-01-27Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 3 The Unsafe Sea The Unsafe Sea
1975-02-10Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 4 The Change of Life The Change of Life
1975-02-17Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 5 Project Fido Project Fido
1975-02-24Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 6 The Planets The Planets
1975-03-10Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 7 The Long, Long Walkabout The Long, Long Walkabout
1975-04-07Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 8 The Overworked Miracle The Overworked Miracle
1975-04-14Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 9 Not the Cheapest, But the Best Not the Cheapest, But the Best
1975-04-21Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 10 A Spoonful of Roughage A Spoonful of Roughage
1975-04-28Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 11 Brain Poison Brain Poison
1975-05-05Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 12 The Bulldog's Last Bark? The Bulldog's Last Bark?
1975-05-12Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 13 Benjamin Benjamin
1975-05-19Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 14 The McMaster Experiment The McMaster Experiment
1975-06-02Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 15 The Glazed Outlook The Glazed Outlook
1975-06-09Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 16 The Three Chord Trick The Three Chord Trick
1975-06-16Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 17 The Cleanest Place in the World The Cleanest Place in the World
1975-06-23Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 18 Strange Sleep Strange Sleep
1975-06-30Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 19 The Greatest Advance Since the Wheel? The Greatest Advance Since the Wheel?
1975-07-07Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 20 How Do You Read? How Do You Read?
1975-07-14Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 21 The Sickly Sea The Sickly Sea
1975-07-21Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 22 Happy Catastrophe Happy Catastrophe
1975-07-28Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 23 To Die, to Live - The Survivors of Hiroshima To Die, to Live - The Survivors of Hiroshima
1975-08-04Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 24 Cannabis Cannabis
1975-08-11Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 25 Meditation and the Mind Meditation and the Mind
1975-08-18Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
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Horizon Season 12 :Episode 26 The Trobriand Experiment The Trobriand Experiment
1975-12-29Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
