Planck spacecraft

"The Planck spacecraft, built by the European Space Agency (Esa), will hover in space a million miles from Earth and search the skies for faint traces of radiation left over from the universe's explosive birth 14 billion years ago.

The van-sized probe will gather these echoes of the Big Bang using instruments cooled to -273C in order to stop any traces of heat distorting the results."
Chilled spacecraft to coldly go in search of Big Bang | UK News | The Observerhttp://observer.guardian.co.uk/uk_news/story/0,,2005633,00.html