| 1. | Should they be able to calculate frequencies of hydrogen lines?
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| 2. | The rotation curve of our galaxy has been calculated using the 21 cm hydrogen line.
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| 3. | Class W or WR represents the Wolf Rayet stars, notable for spectra lacking hydrogen lines.
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| 4. | The spectrum also includes C IV and N IV, but no hydrogen lines at all.
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| 5. | Type Ib supernovae lack hydrogen lines in their spectra.
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| 6. | Some hydrogen lines are seen in emission but generally combined on hidden by other broad emission.
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| 7. | Their spectra have neutral helium, which are most prominent at the B2 subclass, and moderate hydrogen lines.
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| 8. | It displayed an absence of hydrogen lines, but broad, diffuse lines of neutral ( non-ionized ) helium.
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| 9. | In the early years, it took days to chill, and remove the impurities from, the hydrogen lines.
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| 10. | It is only when the two temperatures differ, or decoupled, that the hydrogen line can be observed.
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