"Dark Galaxy" Identified by Hubble

NASA's Hubble Space Telescope has revealed an exceptional discovery in the Perseus galaxy cluster: CDG-2, an ultra-low surface brightness galaxy composed of 99% dark matter. This elusive galaxy remained hidden until astronomers detected a slight increase in globular cluster density, suggesting the presence of an underlying galactic structure. Observations from Hubble, ESA's Euclid observatory, and the Subaru Telescope confirmed a faint halo of diffuse light surrounding these ancient star clusters. Analysis indicates CDG-2 has the luminosity of approximately six million Sun-like stars, with the clusters comprising about 16% of its visible matter. The galaxy's normal matter was likely stripped away through gravitational interactions within the Perseus cluster. This discovery provides a rare opportunity to study dark matter's fundamental properties and how it shapes galactic evolution across the universe. For more information, visit science.nasa.gov/mission/hubble Credit: NASA's Goddard Space Flight Center Paul Morris: Lead Producer Video Credits: A simulation of the formation of dark matter structures from the early universe until today. Ralf Kaehler/SLAC National Accelerator Laboratory, American Museum of Natural History Image of the Subaru Telescope: NAOJ via ESA Music Credit: "Lost to Eternity" by Timothy James Cornick [PRS] via BBC Production Music [PRS] and Universal Production Music This video can be freely shared and downloaded at https://svs.gsfc.nasa.gov/14924. While the video in its entirety can be shared without permission, the music and some individual imagery may have been obtained through permission and may not be excised or remixed in other products. Specific details on such imagery may be found here: https://svs.gsfc.nasa.gov/14924. For more information on NASA’s media guidelines, visit https://www.nasa.gov/multimedia/guidelines/index.html. See more Hubble videos on YouTube: https://www.youtube.com/playlist?list=PLiuUQ9asub3Ta8mqP5LNiOhOygRzue8kN Follow NASA's Hubble Space Telescope: · Facebook: https://www.facebook.com/NASAHubble · X: https://twitter.com/NASAHubble · Instagram: https://www.instagram.com/NASAHubble · Flickr: https://www.flickr.com/photos/nasahubble --- If you liked this video, subscribe to the NASA Goddard YouTube channel: https://www.youtube.com/NASAGoddard Follow NASA’s Goddard Space Flight Center · Instagram http://www.instagram.com/nasagoddard · X http://twitter.com/NASAGoddard · Facebook: http://www.facebook.com/NASAGoddard · Flickr http://www.flickr.com/photos/gsfc