If we were to look at the sky with a radio telescope tuned to 408 MHz, the sky would appear radically different from what we see in visible light. Instead of seeing point-like stars, we would see distant pulsars, star-forming regions, and supernova remnants would dominate the night sky.
Sonoran Conservative 
The sky is full of radio sources. When I’m in a quiet radio zone, I tell when Jupiter is above the horizon by listening on the 15 or 17 meter amateur radio bands. The planet is a significant radio noise source across the upper end of the HF radio spectrum.
https://radiojove.gsfc.nasa.gov
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One of my favorite shows on TV is “How The Universe Works”, narrated by Mike Rowe. They were talking about pulsars the other day, and how fictional space travelers of the future could use them much like we currently us our GPS satellite system for interstellar navigation.
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