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环状星云
释义
环状星云
Encyclopedia
理学
行星状星云
释
Ring Nebula
环状星云
位于天琴座的典型的行星状星云。星表中的编号为M57和NGC6720。位于北天区,距离地球2300光年,目视星等8.8,半径约1.3光年。由于面向地球呈环状结构,并处于明亮的织女星以南,长期以来备受关注。
Astronomy
annular nebula; ring nebula
环状星云
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secretary-general of the United Nations
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secret color porcelain lotus bowl
Secret Committee of Correspondence
secret communication
Secret Diaries
secret diplomacy
Secret Documentary
Secret Formula for Painting Portraits
Secret History of the Mongols
secretin
secretion
secretion of gastric juice
secretion system
secret key
secret key capacity
secret-key capacity
secret-key cryptosystem
Secret Love Affair
Secret Love In Peach Blossom Land
secret memorial to the emperor
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