MSN - One of the most extensively studied stellar streams within the galactic halo of the Milky Way is the GD-1 stellar stream.
It is known for its long, thin structure and distinctive features. It exhibits spur and gap features that have puzzled scientists for many years.
A team of researchers led by Hai-Bo Yu, a professor of physics and astronomy from the University of California, Riverside, proposed that these strange features may result from a core-collapsing self-interacting dark matter (SIDM) subhalo, a smaller and denser satellite halo within the galactic halo.