Image Credit: Pieter van Dokkum, Roberto Abraham, Gemini Observatory/AURA.

More Than Meets the Eye: A Massive Galaxy That's Nearly All Dark Matter

The ultra-diffuse galaxy Dragonfly 44, located in the Coma Cluster of galaxies, has the mass and size of the Milky Way galaxy, but very few stars. The other 99.99% of the mass is a form of dark matter. Observations made with the Gemini and Keck Observatories were used to infer the mass of the galaxy from the motions of its stars and to take a census of its globular cluster population.

Read more in the Gemini Press Release.

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