NASA's Hubble Reveals 'Ghost Galaxy' Rich in Dark Matter

Astronomers discovered a mysterious galaxy, CDG-2, which is mostly composed of dark matter, located 300 million light-years away in the Perseus cluster. Unlike most galaxies detected by their starlight, CDG-2 was identified through globular clusters acting as cosmic markers. David Li and his team employed advanced statistical methods to locate this galaxy by analyzing the dense star clusters. Verification was conducted using observatories including Hubble, Euclid, and Subaru, revealing a faint glow indicating the presence of a hidden galaxy. Early observations suggest CDG-2 is comprised mainly of dark matter, with 99% of its mass hidden from view, making it a significant find in the ongoing search for dark matter galaxies.