Super star cluster Westerlund 1. Only 15,000 light-years away in…

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Super star cluster Westerlund 1. Only 15,000 light-years away in our Milky Way neighborhood, yet home to one of the largest stars ever discovered. [1280 x 1219] via /r/spaceporn http://ift.tt/2mctIkB

from Tumblr http://ift.tt/2mxgxOq

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