| 11. | The liquid-hydrogen line from the LPFTP to the HPFTP is insulated to prevent the formation of liquid air.
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| 12. | The leak was in liquid-hydrogen lines.
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| 13. | The spectrometer was centered on the 21 cm hydrogen line in the rest frame of each observed star.
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| 14. | They have even weaker hydrogen lines than F, but along with the ionized metals, they have neutral metals.
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| 15. | In all the fuss, it slipped my mind that the article should really talk about the 21-centimeter hydrogen line.
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| 16. | He published on the Hydrogen line in the spectrum of Nova Aurigae and in the spectrum of vacuum tubes.
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| 17. | The spectrum also includes hydrogen lines and analysis shows the star is still 40 % hydrogen at the surface.
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| 18. | During the S-II second stage burn, the hydrogen line feeding the engine number two igniter broke due to vibration.
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| 19. | The name refers to the Mount Wilson Catalog of B and A stars with bright hydrogen lines in their spectra.
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| 20. | There is a strong tendency for WNE stars to be hydrogen-poor while the spectra of WNL stars frequently include hydrogen lines.
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