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Astronomers Discover Dark Galaxy: 99.9% Dark Matter Revealed

3/5/2026

Summary

Story summary

Astronomers identified Candidate Dark Galaxy-2 (CDG-2), a galaxy about 300 million light-years from Earth believed to contain 99.9% dark matter.
Using the Hubble Space Telescope, researchers detected CDG-2 by observing globular clusters that stay bright in faint galaxies.
Further observations with the James Webb Space Telescope are needed to confirm its dark matter content.
Experts say studying such galaxies helps understand dark matter's behavior, offering clearer insights than star-rich galaxies.

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Story summary

Astronomers identified Candidate Dark Galaxy-2 (CDG-2), a galaxy about 300 million light-years from Earth believed to contain 99.9% dark matter.
Using the Hubble Space Telescope, researchers detected CDG-2 by observing globular clusters that stay bright in faint galaxies.
Further observations with the James Webb Space Telescope are needed to confirm its dark matter content.
Experts say studying such galaxies helps understand dark matter's behavior, offering clearer insights than star-rich galaxies.