The Milky Way wasn't always a spiral —and astronomers may finally know why it 'shape-shifted'

A century-old mystery of how galaxies change shapes has been solved by considering 'survival of the fittest' collisions between cosmic titans.

from Livescience https://www.livescience.com/space/cosmology/the-milky-way-wasnt-always-a-spiral-and-astronomers-may-finally-know-why-it-shape-shifted
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