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

  • 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.

    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.

    Ana Bonaca, ESA, Gaia

    Low Resolution Image

    High Resolution Image