单词	metallicity
释义	metallicity /mɛtəˈlɪsɪti / noun (plural metallicities) [mass noun] 1The property of being metallic. 1.1 Astronomy The proportion of the material of a star or other celestial object that is an element other than hydrogen or helium: [count noun]: another study of these galaxies shows that they have very low metallicities... However, independent information comes from extrasolar planet host metallicities, the supernova rate and the metallicity evolution of the Galaxy. The ratio of heavier elements to hydrogen and helium is known as metallicity. Scientists can look at stars all over the galaxy and determine the metallicity at the time they were formed.
随便看	flying picket flying saucer Flying Scotsman flying snake flying squad flying squirrel flying start flying suit flying tackle flying trapeze flying visit flying wedge flying wing fly in the face of fly into a rage (or temper) fly kick flyleaf flyman flyness Flynn Flynn, Errol fly off the handle fly on the wall fly orchid fly (or drive) by the seat of one's pants

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