Three newly-discovered streams arcing high over the Milky Way Galaxy are remnants of cannibalized galaxies and star clusters. The streams are between 13,000 and 130,000 light-years distant from Earth and extend over much of the northern sky. Two of the newly discovered streams are almost certainly the remains of ancient star clusters. The third stream is spread over a much larger region of the sky, and is most likely the scattered remains of a dwarf galaxy.
NASA/JPL-Caltech/R. Hurt (SSC)