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All galaxies, regardless of size, rotate once every billion years.

"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 round."

The researchers investigated numerous galaxies of all shapes, sizes, and rotational velocity, ranging from small dwarf irregulars to massive spirals.

Source: https://www.zmescience.com/space/galactic-clockwork-432432/?goal=0_3b5aad2288-0b322bc33c-242764853


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