Dwarf galaxy's sudden arrival near Milky Way surprises researchers

An entire dwarf galaxy has caught astronomers by surprise, appearing in orbit around the Milky Way when, last they looked, it hadn't been there. Called the Crater 2 dwarf galaxy, this 'new' Milky Way neighbor was recently detailed by researchers in a new study, and is said to be the fourth largest dwarf galaxy in the Milky Way. How did …