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neutron star

(Encyclopedia) neutron star, extremely small, extremely dense star, with as much as double the sun's mass but only a few miles in radius, in the final stage of stellar evolution. Astronomers Baade…

Samuel PRICE, Congress, WV (1805-1884)

Senate Years of Service: 1876-1877Party: DemocratPRICE, Samuel, a Senator from West Virginia; born in Fauquier County, Va., July 28, 1805; moved with his parents to Preston County in 1815;…

Thomas METCALFE, Congress, KY (1780-1855)

Senate Years of Service: 1848-1849Party: WhigMETCALFE, Thomas, a Representative and a Senator from Kentucky; born in Fauquier County, Va., March 20, 1780; moved with his parents to Fayette…

The Sun

Source: The National Aeronautics and Space Administration (NASA) The diameter of our closest star, the Sun, is 1,392,000 kilometers. The Sun is thought to be 4.6 billion years old. The Sun is a…

DK Science: Refraction

PUZZLE FOR THE EYEREFRACTION IN HEAT HAZEMIRAGEFIND OUT MORELight rays usually travel in straight lines, but when they pass from one material to another they can be forced to bend (change…

bremsstrahlung

(Encyclopedia) bremsstrahlungbremsstrahlungbrĕmˈshträˌləng [key]: see X ray.

Rubinstein, Anton Grigoryevich

(Encyclopedia) Rubinstein, Anton GrigoryevichRubinstein, Anton Grigoryevichəntônˈ grîgôrˈyəvĭch r&oomacr;ˈbĭnstīn [key], 1829–94, Russian pianist, composer, and educator. As a piano virtuoso he…

Guchkov, Aleksandr Ivanovich

(Encyclopedia) Guchkov, Aleksandr IvanovichGuchkov, Aleksandr Ivanovichəlyĭksänˈdər ēväˈnəvĭch g&oobreve;chˈkôf [key], 1862–1936, Russian political leader. A prominent businessman, during the…

Fridley

(Encyclopedia) Fridley, city (2020 pop. 29,590), Anoka co., SE Minn., a suburb north of Minneapolis, on the Mississippi River; settled 1847, inc. as a…

Orbiting Astronomical Observatory

(Encyclopedia) Orbiting Astronomical Observatory (OAO), series of four orbiting observatories (see observatory, orbiting) launched between 1966 and 1972 by the National Aeronautics and Space…