Overview
As we close in on the discovery of the 2,000th planet outside our solar system, or exoplanet, the Sky at Night investigates the techniques that are revealing so much about these alien worlds. The programme asks if we are really any closer to finding another world like our own - a second Earth.
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2015 - 1The Billion Pixel Camera January 11, 2015 -
2015 - 2What Have UFOs Done for Us? February 08, 2015
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2015 - 3Hubble: The Five Greatest Images of the Cosmos April 12, 2015
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2015 - 4Venus, Earth's Twin May 10, 2015
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2015 - 5Rosetta Update - A Comet's Story June 14, 2015
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2015 - 6Pluto Revealed July 20, 2015
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2015 - 7Cosmic Blasts August 09, 2015
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2015 - 8Playing With a Clockwork Universe September 13, 2015
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2015 - 9Volcanoes of the Solar System October 11, 2015
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2015 - 10Second Earth? November 08, 2015
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2015 - 11The Real Star of Bethlehem: A Christmas Special December 30, 2015