(Encyclopedia) Teller, Edward, 1908–2003, American physicist, b. Budapest, Hungary, Ph.D. Univ. of Leipzig, 1930, where he studied under Werner Heisenberg. Fleeing the Nazis, he came to the United…
(Encyclopedia) Geiger counter or Geiger-Müller (G-M) counterGeiger countergīˈgər-mŭlˈər, –my&oomacr;ˈlər [key], instrument for the detection and quantitative determination of ionizing radiation…
(Encyclopedia) black hole, in astronomy, celestial object of such extremely intense gravity that it attracts everything near it and in some instances prevents everything, including light, from…
(Encyclopedia) muckrakers, name applied to American journalists, novelists, and critics who in the first decade of the 20th cent. attempted to expose the abuses of business and the corruption in…
(Encyclopedia) star cluster, a group of stars near each other in space and resembling each other in certain characteristics that suggest a common origin for the group. Stars in the same cluster move…
(Encyclopedia) International Geophysical Year (IGY), 18-month period from July, 1957, through Dec., 1958, during a period of maximum sunspot activity, designated for cooperative study of the solar-…
(Encyclopedia) silicate, chemical compound containing silicon, oxygen, and one or more metals, e.g., aluminum, barium, beryllium, calcium, iron, magnesium, manganese, potassium, sodium, or zirconium…
(Encyclopedia) bariumbariumbârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft,…
(Encyclopedia) technetiumtechnetiumtĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,…
Sources: NASA and Harvard-Smithsonian Center for Astrophysics. NASA's most powerful X-ray telescope, called the Chandra X-ray Observatory (CXO), was launched from the space shuttle Columbia…
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