Release Images

Release No.: 2019-18
For Release: Monday, July 29, 2019 - 12:00pm

A Stellar Stream in the Milky Way Provides Evidence of Dark Substructure

GD-1 stellar stream

The colors of the stars in this GD-1 stellar stream model overlaid on a Gaia flux map show how the star's orbits were affected by the impact of the unknown dark substructure with white representing a large difference and dark red representing almost no difference. The stream's orbit is overplotted in the foreground.

Credit: Ana Bonaca, ESA, Gaia