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[i]The billion-euro Herschel observatory has run out of the liquid helium needed to keep its instruments and detectors at their ultra-low functioning temperature. This equipment has now warmed, meaning the telescope cannot now see the sky. Herschel, which was sensitive to far-infrared and sub-millimetre light, was launched in 2009 to study the birth of stars and the evolution of galaxies. Its 3.5m mirror and three state-of-the-art instruments made it the most powerful observatory of its kind ever put in space.[/i]
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