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Re:Fast radio bursts from space have baffled scientists for ... by ceejayoz on Thursday September 12, 2019 @11:59AM (#20952981)
If you connect a multimeter to some unknown wiring poking out of your walls, you can get the voltage, even if you don't know what it's connected to.

Specifically to radio astronomy: https://en.wikipedia.org/wiki/Luminosity#Radio_luminosity

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