Wikipedia
Cosmic noise
Cosmic noise and galactic radio noise is random noise that originates outside the Earth's atmosphere. It can be detected and heard on radio receivers.
Usage examples of "cosmic noise".
Even if the signal is genuinely artificial, cosmic noise could easily cause a slight error, perhaps one pulse too many, a misplaced gap.
What we have done travels on and on, we cannot tell how far, before it's lost in the cosmic noise.
Ryerson's tone came gnatlike in his earphones, almost lost in an endless crackling of cosmic noise.
Then reality would waver like a station dialed in and out on a gigantic radio, eventually swinging him over into endless striations of static, alien DJs and cosmic noise.