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Without the invisible framework of dark matter, galaxies would fly apart. Astronomer Vera Rubin proved back in the 1970s that stars rotate as if held by an unseen mass. But new research shows it's not just passive ballast. If dark matter is an ultralight field, then in the young universe it generated giant magnetic fields.

Right after the Big Bang, in the era of the first atoms, this field began oscillating in a single rhythm. Like a microphone catching its own feedback from the speakers, the slightest trembling of dark matter repeatedly amplified faint magnetic fields. A quiet hum turned into a deafening howl — the fields grew to the scale of entire galaxies.

Thus the cosmos acquired a magnetic framework, whose measured strength matches predictions. What's even more astonishing: a dark matter particle may be billions of times lighter than an electron, but their collective trembling filled the Universe with magnetism.