Herschel Completes Cryostat Tests
Europe's Herschel infrared telescope has completed a series of crucial tests intended to verify the performance of its vital cryostat. The 2.5-meters-high, 2-meters-wide cryostat must keep Herschel's instruments at 1.7 K (-271.3 C) so they do not emit infrared signals that can interfere with...
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