Rydberg atom
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Photoionization
Dication
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Airglow
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Metallicity
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Laser safety
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Electrical breakdown
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Autoionization
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Coma (comet)
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Hyperfine structure
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Excited state
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67P/Churyumov–Gerasimenko
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Stingray Nebula
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Dumbbell Nebula
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Ion source
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Neon lamp
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Mass spectrometry
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Proplyd
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Messier 87
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Helix Nebula
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Orion Nebula
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Ionization energy
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Ionization
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Solar flare
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Aurora
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Thermosphere
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Ultraviolet
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SN 1987A
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Comet
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Photoionisation
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Photo-Ionization
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