noun (plural metallicities)
1The property of being metallic.
1.1 Astronomy The proportion of the material of a star or other celestial object that is in elements other than hydrogen or helium.
- 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.
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