| 31. | ? Phoenicis is a spectroscopic binary and a small amplitude variable star.
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| 32. | Using chromatography and spectroscopic methods, as well as others.
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| 33. | Spectroscopic observations of the Sun and photometric observations of stars were initiated.
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| 34. | Spectroscopic observations in the 1900s gave the first clues about the Venusian rotation.
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| 35. | Figure 1 ( b ) illustrates this transition with the corresponding spectroscopic notation.
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| 36. | Spectroscopic observations show that all planetary nebulae are expanding.
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| 37. | Spectroscopic studies have provided detailed measurements of the nucleus.
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| 38. | The exact composition may be determined by spectroscopic studies.
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| 39. | Spectroscopic examination revealed that it was mostly tar and nicotine from tobacco smoke.
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| 40. | MASINT chemical and spectroscopic sensors could determine its propellant.
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