Westerlund 1
Westerlund 1 is a red supergiant cluster in the constellation Ara. As its name suggests, it was discovered by Bengt Westerlund in 1961. Westerlund also discovered the largest known star, WOH G64. Westerlund 1 is notable for containing four extreme red supergiant stars. Westerlund 1 also contains six yellow hypergiants, 24 Wolf Rayets, and a Luminous blue variable among many… Continue reading Westerlund 1