Baby Photos of a Galaxy Cluster

Baby Photos of a Galaxy Cluster

While ClJ1446 is smaller and less massive than most present-day clusters, it is probably very similar to what they looked like 10 billion years ago. Therefore, this work can help improve our understanding of how our nearby galaxy clusters likely evolved.

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