Possible perp found in mystery of Milky Way’s missing galaxy pals
Supernova turmoil could have blasted away galactic building materials

VIRTUAL GALAXY New simulations show that supernovas whittle away at the sea of dark matter surrounding our galaxy (left), leaving only a few blobs that are massive enough (circled) to create satellite galaxies. The image on the right, from the same simulation, shows where stars end up forming.
The FIRE project