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Yes but in some cases, astronomy uses slightly different definitions of key scientific terms: "metal", for example, means anything other than hydrogen or helium
by a-priori 9y ago
Yes but in some cases, astronomy uses slightly different definitions of key scientific terms: "metal", for example, means anything other than hydrogen or helium.
- nkoren 9y agoNonsense. Nickel-iron asteroids are called "metallic," because they're largely made out of, well, metal. Stony asteroids are called "carbonaceous" because they've got a lot of carbon. They're very definitely not called "metal". And astronomers believe that the core of Jupiter is both hydrogen and metallic -- hydrogen compressed to the point where it acquires the property of a metal. So: there are many things that are neither hydrogen nor helium nor metal, and a few things which are both hydrogen and metal.
- aexaey 9y agoI think GP meant "metallicity" as a property of stellar objects: https://en.wikipedia.org/wiki/Metallicity https://en.wikipedia.org/wiki/Metallicity
- deleted 9y ago[deleted]