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1. The nebula NGC 2363 shown in the figure below is located within the galaxy NGC 2366 in the constellation Camelopardalis (the Camel). The galaxy

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1. The nebula NGC 2363 shown in the figure below is located within the galaxy NGC 2366 in the constellation Camelopardalis (the Camel). The galaxy and the nebula within it are moving away from us at 85 km/s. At what wavelength does the red 656.3 nm hydrogen alpha Balmer line (which causes the colour of the nebula) actually appear in this nebula's spectrum (6 marks)? Image credit: L. Drissen, J.-R. Roy and C. Robert (Departement de Physique et Observatoire du Mont Megantic, Universite Laval) and NASA/ESA

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