Galaxy Cloaked in Darkness Hints at 99% Dark Matter
Astronomers using the Hubble Space Telescope identified CDG-2, a very dim galaxy in the Perseus cluster that appears to be 99% dark matter, with most of its normal matter stripped away by the crowded environment; the galaxy is inferred from a surrounding globular cluster population, marking it as one of the most dark-matter–dominated galaxies and a test bed for theories of dark matter and star formation.
