Ever hear of nebulium? It was the element that was discovered in 1864, and nearly busted the periodic table of elements. It didn’t fit in anywhere! And that made sense — when you consider that the ...

IN a recent communication (NATURE, Jan. 7, p. 12) C. T. Elvey has applied the ‘expanding shell’ theory of novæ to calculate the maximum density at which oxygen can be made to give the nebulium ...

IN a recent paper (NATURE, Jan. 28, p. 136) S. R. Pike pointed out that the condition of coexistence of O ++ and H lines in the spectra of new stars leads to a density of the order 10-7 gm./c.c., ...

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