Seen in a recent picture from the NASA/ESA Hubble Space Telescope, the globular cluster M5 is revealing a few young stragglers among its elderly population of stars.
Most of the stars in this cluster of millions—one of the oldest globular clusters in the Milky Way—formed more than 12 billion years ago. But this composite picture shows several young-looking blue stars in the mix.
Astronomers think the youngsters were born during stellar collisions or are older stars that maintain the appearance of youth via the transfer of mass between binary pairs.
Image courtesy ESA/NASA