Puffs of this element condensing around R Coronae Borealis stars cause them to decrease in luminosity by up to eight magnitudes at irregular intervals. This element makes up the majority of MAONs (“M-A-O-Ns”) and other compounds that are thought to be the source of so-called “unidentified infrared emission features.” Classifications of stars rich in this element typically include a number indicating the intensity of the Swan bands. The existence of a 7.65 MeV (“M-E-V”) excited state of this element with angular momentum and parity 0+ (“zero-plus”) was first predicted by Fred Hoyle. Oxygen and this element are the main components of the cores of asymptotic giant branch stars. Diffuse interstellar bands likely originate from compounds with large amounts of this element, such as PAHs (“P-A-Hs”) and fullerenes. For 10 points, name this element that is created in the triple-alpha process through the fusion of three helium atoms. ■END■
ANSWER: carbon [or C] (MAONs are mixed aromatic-aliphatic organic nanoparticles. PAHs are polycyclic aromatic hydrocarbons.)
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