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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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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
More clips from World at One
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Partial curfews ordered after riots and looting in France
Duration: 04:26
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Did Tesla really just unveil a flying car?
Duration: 06:40
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Director General of MI5 warns about threat of AI and Russia
Duration: 05:18
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Could remains found in Wales prove this fort wasn't a myth?
Duration: 03:36
