Bubble-shaped nebula created by pre-supernova only 70,000 years old
[CLICK ON IMAGE FOR HIGH RESOLUTION, Jeff Husted] 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. … The massive […]