Blown by fast winds from a hot, massive star, this cosmic bubble is huge.

Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon.…
http://myfusimotors.com/2019/01/31/sharpless-308-star-bubble/