l天琴座中的环状星云是最著名的行星状星云。
L the Ring nebula in Lyra is the best-known of the planetary nebulae.
赛非星系能量巨大，因为在其中心有-一黑洞，黑洞周围则环绕着环状星云。
Seyfert galaxies are energetic because they have a central black hole surrounded by a ring of gas.
环状星云的物质在吸收到黑洞中去的过程中，一部分转化成了能量，而这一能量向宇宙空间辐射。
As matter is sucked from the ring into the hole, part of it is converted into energy, which is radiated into space.
上图中的行星状星云叫做Shapley1以著名天文学家Harlow Shapley的名字命名，它有非常明显的环状结构。
This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure.
上图中的行星状星云叫做Shapley1以著名天文学家Harlow Shapley的名字命名，它有非常明显的环状结构。
This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure.
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