FAST J0139+4328 is a dark galaxy 94 million light years away, visible in radio waves with minimal visible light. It was discovered by the Chinese Five-hundred-meter Aperture Spherical radio Telescope (FAST). References Discovery of an isolated dark dwarf galaxy in the nearby universe, Jin-Long Xu, Ming Zhu, Naiping Yu, Chuan-Peng Zhang, Xiao-Lan Liu, Mei Ai, Peng Jiang, 6 Feb 2023 Astronomy Galactic astronomy Dark matter