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Ken M. Harrison
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“prominent lines in the star’s spectrum these will show up. Likewise, if there is a planetary nebula or a bright emission nebula in the field these will only show as small points (due to the fine emission lines of the gases involved) rather than a spread out spectrum. This makes the grating a handy tool for finding faint planetary nebula. (See Chap. 7 for more detail.)”
― Grating Spectroscopes and How to Use Them
― Grating Spectroscopes and How to Use Them
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