Previous images of the Ring Nebula taken by visible-light telescopes usually showed just the inner glowing loop of gas around the star.
以前由可见光望远镜拍摄的星云环仅仅显示出其内部的环绕着恒星的炽热气体环。
Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon.
面纱星云也被称为天鹅座环，现在的视角跨度近3度，即大约6倍满月的直径。
Although glowing like an emission nebula, the origin of the bubble, known as Barnard's Loop, is currently unknown.
尽管像发射星云，猎户座的泡泡，为人所熟知的巴纳德环，到现在还有很多未知之处。
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