Ep. 682: Ultra-Diffuse Galaxies & Dark Matter

from 365 Days of Astronomy - Weekly Edition

Astronomers first noticed the strange behaviors of rotating galaxies almost 100 years ago, suggesting there's an invisible dark matter hold them together with gravity. Or maybe we just don't understand how gravity works at the largest scales. Observations are much better now, and astronomers have found examples of galaxies that are almost entirely made of dark matter. Does this tell us anything?

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This episode was published on May 22, 2023.

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