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Nebulium was a proposed element found in a nebula by William Huggins in 1864. The strong green emission lines of the Cat's Eye Nebula, discovered using spectroscopy, led to the postulation that an as yet unknown element was responsible for this emission. — “Nebulium - Wikipedia, the free encyclopedia”, en.wikipedia.org
Nebulium is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia. A fact from Nebulium appeared on Wikipedia's Main Page in the Did you know?. — “Talk:Nebulium - Wikipedia, the free encyclopedia”, en.wikipedia.org
In 1927 he discovered that nebulium was not really a chemical element but instead doubly ionized oxygen. Contents. 1 Life and work Bowen published his findings in 1927 and concluded that nebulium was not really a chemical element. Bowen was elected to the National Academie of Science in 1936. — “Ira Sprague Bowen - Wikipedia, the free encyclopedia”, en.wikipedia.org