Artist's rendering of C-19's place in the Milky Way.
Credit: International Gemini Observatory/NOIRLab/NSF/AURA/J. da Silva/Spaceengine. Acknowledgment: M. Zamani (NSF’s NOIRLab)
Astronomers have found the ruins of an ancient globular cluster in the outskirts of the Milky Way. Using the Canada-France-Hawaii and Gemini North telescopes on Maunakea, in conjunction with the Gaia satellite, they showed that the motions and compositions of stars in an outer-galaxy “stream” mean that it must have originated as a globular star cluster. In fact, this stream is the most pristine, having very low quantities of heavier elements from prior generations of stars, than ever before observed in our galaxy.