NASA’s Hubble telescope detects possible ‘dark galaxy’

By Jacopo Prisco, CNN (CNN) — Astronomers have spotted a galaxy so faint, it’s almost invisible — a discovery that could help illuminate one of the most elusive subtances in the universe. The researchers found Candidate Dark Galaxy-2, or CDG-2, using the Hubble Space Telescope, and they believe it’s made of at least 99.9% dark