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H-alpha (Hu03b1) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level. H-alpha light is important to astronomers as it is emitted by many emission nebulae, and can be used to observe features in the sun's atmosphere including solar prominences.
by zuctronic on 2016-02-13
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