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"Comets are treasure chests about our own history"
Mark Mardell speaks to Professor Mark McCaughrean from the European Space Agency
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News and politics clips
Listen to a selection of clips from recent and upcoming programmes.
More clips from 14/11/2014
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Counter-terrorism measures "probably getting to the right place"
Duration: 03:01
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"They had no fear at all of being caught"
Duration: 04:17
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No ring, no bring: Is Taylor's wedding plus-one policy right?
Duration: 05:27
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Why airlines have strict rules around packing power banks
Duration: 04:22
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Court of Appeal to look at case of boys not jailed for rapes
Duration: 04:40
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Evan and Sarah: Is the US being ripped off?
Duration: 10:36
