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Last broadcast on Mon, 21 Sep 2009, 20:00 on BBC HD (see all broadcasts).
Synopsis
Geography series with Dr Iain Stewart. Our planet is unique within the solar system. Four-and-a-half billion years ago it had a twin named Theia which was absorbed into the Earth, increasing its gravity and allowing it to form an atmosphere. Iain travels to Meteor Crater in Arizona to explore the atmosphere's role in protecting us from bombardment by meteorites. Life on earth only prospers because it is provided with right amount of heat from the sun.
Credits
- Presenter
- Ian Stewart
Broadcasts
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Tue 18 Dec 200721:00
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Thu 20 Dec 200702:35
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Sun 30 Dec 200717:05
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Sun 17 Feb 200822:00
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Sun 31 Aug 200819:00
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Sun 28 Dec 200812:00
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Mon 21 Sep 200920:00
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