Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 4, 2025
They are always accompanied by, or superposed upon, a spectrum of dark lines, in producing which sodium and iron have an obvious share; and certain bright rays, noticed by Secchi with imperfect appliances as enhancing the chiaroscuro effects in carbon-stars, came out upon plates exposed by Hale and Ellerman in 1898 with the stellar spectrograph of the Yerkes Observatory.
Model by Ellerman of summit of Mount Wilson, showing the observatory buildings among the trees and bushes. The 60-foot tower on the extreme left, which is at the edge of a precipitous cañon 1,500 feet deep, is the vertical telescope of the Smithsonian Astrophysical Observatory.
Word Of The Day
Others Looking