Word: spectras
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...Edwin Powell Hubble of Mt. Wilson Observatory has detected nebulae 500,000,000 light-years away, but only up to half that distance have satisfactory spectra been obtained...
...other 11 representatives from Harvard included Dr. Annie J. Cannon, committee on stellar spectra; Dr. Dorrit Hoffleit, committee on meteors and related problems; Miss Jenka Mohr, committee on nebulae and star clusters; and Dr. Theodore E. Sterne, Dr. Martin Schwarzschild, Dr. Leo Goldberg, Miss Henrietta Swope, Miss Constance Boyd, Mrs. R. Newton Mayall, Miss Rebecca Jones, and James G. Baker...
...Cannon, who has been on the research staff of the Observatory since 1897, is famous for her classification of the two hundred and twenty-five thousand spectra described in the Henry Draper Catalogue of Stellar Spectra, and for her work in the field of variable stars. She has received many honors in this country and abroad...
...lately lost favor among astronomers. Evidence for the recession of the nebulae is that, when their light is broken up into a spectrum, certain lines are shifted far to the right, or red end of the chromatic scale. Smaller shifts of this sort have been observed in the spectra of comparatively nearby stars known to be moving away from the solar system...
...Human knowledge of the outermost fringes of this sphere is mostly due to the work of Astronomers Edwin Powell Hubble and Milton La Salle Humason, whose long looks into space are made possible by Mt. Wilson Observatory's 100-inch telescope. Even with this giant instrument, catching the spectra of far-off island universes has required all-night exposures for several nights...