A dramatic new image of a cosmic gas bubble reveals never-before-seen details of this birthplace of stars. 

The bubble surrounds the Westerlund 2 star cluster, one of the brightest star-forming regions in the Milky Way. Westerlund 2 is about 20,000 light-years from Earth, and it hasn’t been observed in high resolution until now. The new image shows that the star cluster is surrounded by a single bubble of gas, not two as previously hypothesized, and that it’s likely to keep birthing stars well into the future. 



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