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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Henry Norris Russell (1877-1957), the American astronomer. In 1913 he discovered that the absolute magnitude (intrinsic brightness) of stars... more
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Henry Norris Russell (1877-1957), the American astronomer. In 1913 he discovered that the absolute magnitude (intrinsic brightness) of stars correlates well with their spectral types, which are indicative of surface temperature, and related to their colour. He plotted these two parameters to make what is now known as the Hertzsprung- Russell diagram. Although its interpretation by Russell as being representative of the path of stellar evolution was quickly abandoned, the diagram has remained an important tool in astro- physics. Russell also used the solar spectrum to study chemical abundances in the Sun, and so was able to make an estimate of its hydrogen content.
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