Movatterモバイル変換

Explanation:Because the Gum Nebula is the closestsupernova remnant, it is actually hard to see. Spanning 40degrees across the sky, the nebula is solarge and faint it is easily lost in the din of a bright and complex background. TheGum Nebula, highlighted nicely in theabove wide angle photograph, is so close that we are much nearer the front edge than the back edge, each measuring 450 and 1500light years respectively. Thecomplex nebula lies in the direction of theconstellations ofPuppis andVela. Oddly, much remains unknown about theGum Nebula, including the timing and even number ofsupernova explosions that formed it.