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Ion Engine Enters Space Race Monday, April 21, 2008 - Sarah Gingichashvili Home >> Headlines >> Space   
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Engineer Neil Wallace peers into a huge vacuum chamber designed to replicate - as far as possible - the conditions of space. Cryogenic pumps can be heard in the background, whistling away like tiny steam engines. Using helium gas as a coolant, they can bring down the temperature in the vacuum chamber to an incredibly chilly 20 Kelvin (-253C). The pressure, meanwhile, can drop to a millionth of an atmosphere.
(source: news.bbc.co.uk)
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