Globular Cluster Terzan 5

Peering through the thick dust clouds of the galactic bulge an international team of astronomers has revealed the unusual mix of stars in the stellar cluster known as Terzan 5. The new results indicate that Terzan 5 is in fact one of the bulge's primordial building blocks, most likely the relic of the very early days of the Milky Way.

This image is from the NASA/ESA Hubble Space Telescope.

Image Credit: ESO/F. Ferraro
Explanation from: https://www.eso.org/public/images/eso1630b/