Space roar: NASA detected the loudest sound in the universe, but what is it?

Space Mysteries: When scientists put their ear to the early universe, they found it yelled back.

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Tau.Neutrino said:

Space roar: NASA detected the loudest sound in the universe, but what is it?

Space Mysteries: When scientists put their ear to the early universe, they found it yelled back.

more…

> ARCADE was able to make “absolutely calibrated zero-level” measurements, which means it was measuring the actual brightness of something in real physical terms rather than relative terms. This was different from typical radio telescopes, which observe and contrast two points in the sky.

> Scientists call the signal “radio synchrotron background” — background being an emission from many individual sources and blending together into a diffuse glow. It has been known since the late 1960s that the combined radio emission from distant galaxies should form a diffuse radio background coming from all directions.

> A signal that was six-times louder than expected by cosmologists.

I give up. What’s causing it?

This development is worth watching for progress in future.