M92
This striking NASA/ESA Hubble Space Telescope image shows a glittering bauble named Messier 92. By exploring the composition of globular clusters like M92, astronomers can figure out how old these clusters are. As well as being bright, M92 is also old, being one of the oldest star clusters in the Milky Way, with an age almost the same as the age of the Universe.
Credits: ESA/Hubble & NASA; Acknowledgment: Gilles Chapdelaine