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Henry Throop 2017 Sagan Medal Winner

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Henry Throop

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Henry Throop has made hundreds of presentations on planetary science to people around the world. Here he shows students how to make a comet out of dry ice, ammonia and dust – the same ingredients used in space – with students at Madikweng Secondary School in rural Lampopo, South Africa.

Credit: Ephraim Manamela

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