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单词
Ring Nebula
释义
Ring Nebula
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
Ring Nebula
指环星云
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orthonormal frame
orthonormal frame bundle
orthonormal function
orthonormal functions
orthonormality
orthonormality condition
orthonormality relation
orthonormality theorem in elastic scattering
orthonormalization
orthonormalization process
orthonormalized functions
orthonormalized polynomials
orthonormal moving frame
orthonormal polynomials
orthonormal sequence
orthonormal set
orthonormal system
orthonormal system of functions
orthonormal system of vectors
orthonormal tetrad
orthonormal transformation
orthonormal vectors
orthonormal wavelet
orthopaedic polymer
orthopanchromatic film
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