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I would assume that they would all be resonating/emitting at similar frequency ranges, but I imagine that if that's the lowest pitch in the known universe, it is by default going to be the slowest. ALTHOUGH, there isn't any air in space to displace and make a measurable wave form with, so I'm curious as to how they measured it in the first place?
Unless hey can measure its frequency vibratingin the earth's atmosphere?
Science dudes (physicists) assemble!