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The radio's gain control is maxed out trying to tune into a non-existant signal. When this happens you hear electrical noise from the radio itself, along with random stray radio waves. Those waves are both manmade and naturally occurring (you've probably heard a pop in the radio from a lightning strike, for instance).
Based on that I'd think if you tuned in from a desolate place in the galaxy, you'd still hear static, just possibly less of it due to the lack of interference from manmade sources aside from the radio itself.
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