Astronomers Discover Galaxy Made Almost Entirely of Dark Matter

Astronomers Discover Galaxy Made Almost Entirely of Dark Matter

A galaxy in space. Credit: ESA Astronomers have identified what may be one of the most extreme galaxies ever observed — a system made up almost entirely of dark matter. The galaxy, known as CDG-2, appears to contain about 99% dark matter, leaving only a faint trace of normal, visible material behind. The discovery was made using observations from the Hubble Space Telescope and the Euclid Space Telescope, along with follow-up data from the Subaru…

Hubble identifies one of darkest known galaxies - The elusive object dubbed CDG-2 may be composed of 99% dark matter

Most galaxies in the nearby Universe are quite luminous, but some are so faint they’re nearly invisible. Astronomers, using the NASA/ESA Hubble Space Telescope in combination with other observatories, identified a galaxy that appears to be almost entirely dominated by dark matter with only a smattering of stars. The galaxy, known as Candidate Dark Galaxy-2 (CDG-2), appears to contain just four globular star clusters (compared to the Milky Way’s 1

Hubble Discovers One of the Darkest Galaxies Known to Exist

Hubble has just discovered one of the darkest galaxies known to exist. It’s named Candidate Dark Galaxy-2, or CDG-2 for short. This faint object is located in the Perseus galaxy cluster, around 300 million light years from Earth. Most galaxies announce their presence with a dazzling display of illumination, but CDG-2 does the opposite, with [...]

"Dark Galaxy" CDG-2 Detected in Perseus

"Dark Galaxy" CDG-2 Detected in Perseus | Hubble Space TelescopeThe low-surface-brightness galaxy CDG-2, shown in this image from the NASA/European Space Agency Hubble Space Telescope, is dominated by dark matter and contains only a sparse scattering of stars. This galaxy is nearly invisible, but by using advanced statistical techniques, scientists identified it by searching for tight groupings of stars called globular clusters at the center of …

What is Candidate Dark Galaxy‑2?

A putative dark galaxy in the Perseus cluster Astronomers have identified a faint object in the Perseus galaxy cluster that behaves like a galaxy but lacks the expected starlight. Designated Candidate Dark Galaxy‑2 (CDG‑2), the object is associated with four compact stellar systems—globular…