Tens of millions of years ago, a humble blue dwarf galaxy plunged through space, leaving hoops of gas and dust in its wake. Now those hoops surround a "new" galaxy. Thanks to the Hubble Space ...

This is a wide-angle view of the distribution of known satellite galaxies orbiting the large Andromeda galaxy (M31), located 2.5 million light-years away. The Hubble Space Telescope was used to ...