An arc of blue stars that stretches for thousands of light-years sits just above the nearby galaxy Centaurus A. Astronomers analyzing the arc have discovered that it’s the stellar remains of a tiny galaxy that was swallowed by Centaurus A only a few hundred million years ago. In the December Astronomical Journal, the scientists report that this relatively recent example of galactic cannibalism is another indication that material ripped from smaller galaxies is a key contributor to the formation of halos–the tenuous outer perimeters of galaxies.