Galaxies hide some of the biggest mysteries of the Universe and could one day provide more precise insights into how our cosmos evolved over the last 13.8 billion years. The distant worlds vary in so many ways, but for the first time ever, astronomers have discovered something common in them — their rotational behavior.

Scientists from the International Centre for Radio Astronomy Research have found all galaxies, from small dwarf irregulars to the largest spirals, behave like clocks and take about a billion years to complete a single spin.

“It’s not Swiss watch precision,” Professor Gerhardt Meurer from the center said in a statement. “But regardless of whether a galaxy is very big or very small, if you could sit on the extreme edge of its disk as it spins, it would take you about a billion years to go all the way around.”

The group made the discovery after establishing a direct relation between the size and average interior density of galaxies with sophisticated calculations. They found if the size of two galaxies is same, their interior density will also be similar.

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