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What is a metallicity?

What is a metallicity? Here are some definitions.

Noun
  1. (astronomy) The abundance of elements heavier than helium in stars as a result of nucleosynthesis
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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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