Word: infar
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Dates: during 1960-1969
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...strongest of hydrogen's lines, called H-alpha, seemed to be missing entirely from 3C 273's spectrum. If Schmidt's theory was right, the line was not missing but had shifted into the infar-red region of the spectrum, where it would not register on an ordinary photographic plate. Schmidt remembered Astronomer Beverley Oke had already studied the spectrum with an electronic gadget sensitive to invisible infrared. Oke had found a prominent line precisely where Schmidt thought that H-alpha should be, shifted into the infrared. 3C 273 was moving faster than seemed possible...
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