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–part 10 of the essay An astronomer in Texas–
Finally, success! Clear, dark skies for science and also for photography. The milky way is fascinating both in the visible and the infrared, but I prefer the mix that is created by this filter and wavelength-sorted with blue corresponding to green, green to red and red to infrared. The H-alpha regions, where monomolecular hydrogen gets excited and emits light in very strong colours, appears golden.