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This means that SDSS J0018−0939 most likely preserved the elemental abundance ratios produced by a first-generation very-massive star. [7] First generation stars are expected to self-regulate their growth by radiative feedback in the formation process, and to achieve masses typically tens of times that of the Sun. A fraction of stars might ...
Image credits: Detroit Photograph Company "There was a two-color process invented around 1913 by Kodak that used two glass plates in contact with each other, one being red-orange and the other ...
View from the Window at Le Gras 1826 or 1827, believed to be the earliest surviving camera photograph. [1] Original (left) and colorized reoriented enhancement (right).. The history of photography began with the discovery of two critical principles: The first is camera obscura image projection; the second is the discovery that some substances are visibly altered by exposure to light. [2]
In 1986, the first vector-based clip art disc was released by Composite, a small desktop publishing company based in Eureka, California. The black-and-white art was painstakingly created by Rick Siegfried with MacDraw, sometimes using hundreds of simple objects combined to create complex images. It was released on a single-sided floppy disc.
Al Hirschfeld was born in 1903 in a two-story duplex apartment at 1313 Carr Street in St. Louis, Missouri to Russian Jewish parents. [2] [3] He moved with his family to New York City in 1915, [4] where he received art training at the Art Students League and the National Academy of Design.
HE 1523-0901 is the designation given to a red giant star in the Milky Way galaxy approximately 9,900 light-years from Earth. It is thought to be a second generation, Population II, or metal-poor, star ([Fe/H] = −2.95). The star was found in the sample of bright metal-poor halo stars from the Hamburg/ESO Survey by Anna Frebel and
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In reality, many population I stars are also found mixed in with the older population II stars. In 1944 , Walter Baade categorized groups of stars within the Milky Way into stellar populations . In the abstract of the article by Baade, he recognizes that Jan Oort originally conceived this type of classification in 1926 .