Recently I was looking at the APOD from October 2nd called the Bubble Nebula. Based on the picture of the Nebula this really does look like either a bubble or a marble. This nebula spans over ten light years and even though it looks peaceful it is actually a place of rough stellar wind and radiation. The center of this nebula is an O star which is over 45 times as massive as our star. It is amazing how detailed this picture is of the Nebula. This is from the hydrogen and oxygen around the nebula which is used to create the red and blue images in the nebula.
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