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Loading contentImaging through filters that pass only the light of specific emission lines — hydrogen-alpha, oxygen-III, sulphur-II — to isolate the glow of ionised gas and cut through light pollution and moonlight. Narrowband imaging reveals the intricate structure of emission nebulae and is the basis of the popular false-colour 'Hubble palette'.
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Mission data, planetary science, space telescopes, and public-domain imagery.
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