Westerlund 1 star cluster

 
Westerlund 1 star cluster

Image Credit: ESO/VPHAS+ Survey/N. Wright.

The new VST image of the star cluster Westerlund 1, which lies about 16,000 light-years from Earth in the southern constellation of Ara (the Altar). It contains hundreds of very massive and brilliant stars, all of which are just a few million years old. The stars in the cluster appear red due to foreground dust blocking out their blue light. The blue stars are foreground objects and are not related to the cluster. The red supergiant star W26 that probably will soon explode as a supernova is in the upper left of the cluster and is surrounded by a green glow.

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