Sounds of the Vacuum
In space there are no sounds, because sound needs a carrier, like gas or liquid, to spread.
But our universe is not silent, the cosmos is full of spinning stars (pulsars), plasma storms, magnetic field changes,
sun eruptions and thunder storms - only human ears cannot hear them.
Most "sounds" of the universe derive from the imperceptible spectrum of electromagnetic waves - radio signals, microwaves, gamma rays, some from gravitational waves.
For decades, probes like Voyager, Cassini, Van Allen, Cluster and others recorded such data with radio plasma wave instruments or magnetometers. Radio telescopes all over the world catch the background radiation of the big bang, Gravitational-Wave Observatories make black holes audible.
Space organizations such as the National Aeronautics and Space Administration (NASA), The European Space Agency (ESA), universities and private astronomers shift the mostly low frequencies into the audible range (between 20 and 20,000 Hertz) and present them to the public.
The sounds of space seem alien and familiar at the same time.
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