The True Colours of a Blue Straggler

The True Colours of a Blue Straggler

There’s an unexpected population of blue stars identified in clusters, known as blue stragglers. They should have evolved off the main sequence, but some rejuvenating process is in action, keeping them there longer than expected. Their origin and evolution is not fully understood. Today’s paper tackles these two issues, identifying some possible answers as to where these blue straggler stars come from and where they are going.
Image credits: ESA/Hubble