The Massive Stars in Westerlund 1

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Explanation: Star cluster Westerlund 1 is home to some of the largest and most massive stars known. It is headlined by the star Westerlund 1-26, a red supergiant star so big that if placed in the center of our Solar System, it would extend out past the orbit of Jupiter.

from Pocket https://apod.nasa.gov/apod/ap170620.html
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