Herschel completes cryostat tests
TESTS COMPLETED: The Herschel infrared telescope has completed a series of crucial tests intended to verify the performance of its vital cryostat. The 2.5-meter high, 2-meter wide cryostat must keep Herschel's instruments at 1.7 K (-271.3 degrees Celsius) so they do not emit infrared signals that...
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