A Dark Milky Way

The galaxy Dragonfly 44 is roughly the same size and mass of the Milky Way, but it’s much fainter, barely visible in the wide-angle shot (left). Zooming in (right) shows more detail of the elongated galaxy, including the spherical clusters of stars around its core. Dragonfly 44 is dim because most of its mass is dark matter, which makes up a shocking 99.99 percent of the galaxy. | Pieter van Dokkum, Roberto Abraham, Gemini, Sloan Digital Sky Survey