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	Is it true that someone's head would explode if you went out into space without a helmet on? Tanna in Montana, US
	If you go into space, there is essentially no pressure. The pressure of any gases you have in your head at the time would expand and potentially split it apart. However, I've never done the sums to see if it could break apart bone. Your body fluids would also boil instantly and evaporate.
	November 2005

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Listen to this as part of the show: 27th Nov 2005 - Stars, Cosmology and the Beginning of the Universe
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