Astronomers Discover New Galaxy That Is 99.99% Dark Matter âScientists hope this new galaxy could help uncover the truth about dark matter. NASA 149 A team of astronomers at the Keck Observatory in Maunakea, Hawaii, have discovered a massive galaxy made of 99.99 percent dark matter.The galaxy, called Dragonfly 44, is part of a collection of galaxies discovered a year ago by the same team.