Rare Milky Way star cluster is packed with red supergiants 1 million times brighter than the sun 

 Many red supergiant monster stars lurk in a Milky Way cluster astronomers have discovered with the Gaia space telescope. The cluster, Barbá 2, could help understand why some stars become black holes. 

https://cdn.mos.cms.futurecdn.net/wNzXvLhKa8aGAUpcv9w8cg.png

https://www.space.com/milky-way-supermassive-stars-open-cluster