Invisible Galaxies: 70 Candidates for Dark Worlds
The FAST radio telescope in China is a giant dish half a kilometer in diameter, nestled in a natural sinkhole among mountains.
Faint Galaxies Reveal Their Stellar Secrets
Faint galaxies scattered across the Perseus cluster are like ghosts among their bright neighbors. They are so diffuse that distant objects shine through them, and they contain hundreds of times fewer stars than our Milky Way.