Word: ultraviolet
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Dates: during 1960-1969
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...spectrometer takes pictures in 50 wavelengths of ultraviolet light, each invisible from the earth's surface...
...ultraviolet spectrometer constructed at the Harvard College Observatory has given Harvard astronomers over 4,000 pictures of the sun, revealing new information about its distribution of elements and temperature...
...pictures are the first ever taken of the sun in ultraviolet light from a satellite...
...instrument builds up a picture by scanning the sun, back and forth and bottom to top, recording the intensity of ultraviolet radiation of a particular wavelength...
...kind of ions present at various levels of the sun's atmosphere depend on the temperature there. Each kind of ion, a chemical elements stripped of one or more electrons, emits a different wavelength of ultraviolet light...