单词	nebulium
释义	nebulium /nəˈbyo͞olēəm / noun Chemistry, historical A hypothetical chemical element proposed in the 1860s to explain certain lines in the spectra of nebulae, later discovered to arise from forbidden transitions in oxygen and nitrogen ions.The hypothetical nebulium was simply the signature of ordinary oxygen doing extraordinary things.... Coronium and nebulium were both, in the event, figments of the astronomers' imaginations. They called this unknown ‘new’ element nebulium, but modern astronomy has since shown it to be a rare form of superheated oxygen.
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