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Compressors developed at the Department of Engineering Science have formed a key component of the cryocoolers used to cool the infra-red sensors on satellites. Their low mass has trimmed almost $250k from the cost of individual satellite missions. Sixty seven have been sold to date, with sales totalling £2.8M between January 2008 and July 2013; three units are currently in Earth orbit with another nine planned to follow in 2014. A specialised version has been developed to achieve extremely low temperatures, with prototypes already built for the Mid Infra-Red Instrument (MIRI) that will form part of the James Webb Space Telescope.