(Encyclopedia) actiniumactiniumăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp…
(Encyclopedia) periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an…
(Encyclopedia) dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was…
(Encyclopedia) Jones, Quincy (Quincy Delight Jones, Jr.), 1933–, African-American musician, composer, bandleader, and music executive, b. Chicago. Jones played trumpet and sang gospel growing up, and…
(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…
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