| http://www.w3.org/ns/prov#value | - y (APoD)'s photos24 comments on original post21Add a comment...Roger Abella Queralt (DeMS)Shared publicly - 2014-06-03 Brian Koberlein originally shared: Testing MetalIn astronomy, all elements other than hydrogen and helium are referred to as ???metals.??? For this reason, a measure of the amount of other elements a star contains is known as its metallicity.
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