An astrophysicist and a neurosurgeon teamed up on the ultimate galaxy brain theory.

An astrophysicist and a neurosurgeon walked into a room.

It may sound like the beginning of a bad joke, but what a pair of Italian researchers came up with is a truly galaxy brain take: The structures of the observable universe, they say, is astonishingly similar to the neuronal networks of the human brain.

University of Bologna astrophysicist Franco Vazza and University of Verona neurosurgeon Alberto Feletti detail the surprising similarities between the cosmic network of galaxies and the complex web of neurons in the human brain exhibit in a new paper published in the journal Frontiers in Physics. Despite being roughly 27 orders of magnitude apart in scale, the human brain and the composition of the cosmic web show similar levels of complexity and self-organization, according to the researchers.

The brain contains an estimated 69 billion neurons, while the observable universe is composed of at least 100 billion galaxies, strung together loosely like a web. Both actual galaxies and neurons only account for about 30 percent of the total masses of the universe and brain, respectively. And both galaxies and neurons arrange themselves like beads on long strings or filaments.

In the case of galaxies, the remaining 70 percent of mass is dark energy. The equivalent in the human brain, the duo said: water.

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