The European Space Agency (ESA) announced on 29 April that Herschel space observatory spent its supply of liquid helium coolant, meaning the end of more than three years of Universe's “pioneering observations.”

“The event was not unexpected: the mission began with over 2300 litres of liquid helium, which has been slowly evaporating since the final top-up the day before Herschel’s launch on 14 May 2009”, ESA explained.

Without liquid helium to keep i...


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