How to pronounce“nebulium”in English
There’s not nearly as much oxygen as hydrogen, but kilo for kilo oxygen glows more brightly than hydrogen due to the atomic physics involved. This oxygen glows green, giving planetaries their characteristic hue.
Funny: When this green glow was first analyzed spectroscopically, astronomers couldn’t identify the responsible element making it. They dubbed it nebulium, but eventually figured
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Definitions of “nebulium”
A supposed chemical element proposed as a result of spectral analysis of light from a nebula; the emission lines concerned are now known to be due to doubly-ionized oxygen.