Star Stream GD-1

A swirling galaxy with a GD-1 star stream and a dark matter halo. The illustration was created using DALEE and is not a scientific image.

Dark matter solves the mystery of the Milky Way's stellar streams

New study suggests that a dense subhalo of self-interacting dark matter is responsible for the bulge and gap formations of the GD-1 stellar stream, challenging dark matter theories