Discussion
Why does a radio telescope cool its receiver front end?
Answer: D
Cooling reduces the physical temperature and so the thermal noise of the first stage, which is the whole point when the signals are far below any ordinary noise floor. Oscillator stability benefits incidentally but is not the reason. Effective area is geometry. And bandwidth is set by filtering. Where the source is extremely weak the only remaining lever is the receiver's own noise, and temperature is the way to pull it down. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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