National Radio Astronomy Observatory Green Bank

Receiver room of the GBT NRAO Green Bank

The receiver room under the feedhorns. Each of the eight receivers is cooled to a few degrees above absolute zero (0K) with liquid helium. This minimizes radio+infrared system noise so that the super-faint radio signals from space can be amplified many millions of times.

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last updated: September 14, 2011

Author of original content: Nick Strobel