29 juin 2015
Sharpless 308: Star Bubble
http://apod.nasa.gov/apod/ap150623.html Sharpless 308: Star Bubble Image Credit & Copyright: Kfir Simon Explanation: 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...