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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
随便看
plates of middle thickness
plate streaking
plate tectonics
plate tectonic theory
plate theory
plate theory equation
plate triple junction
plate-type electrostatic separator
plate-type steam distributing gear
platfom of space photography
Platform
platform
platform and rack
platform arrangement
platform as a service
platform as a service, PaaS
platform atomization
platform case
platform competition
platform diving
Platform Economics
platform edge door
platform for environment noise information management
platform for hybrid integration
platform for space astronomy
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