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X-ray astronomy
(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...Spanish Succession, War of the
(Encyclopedia)Spanish Succession, War of the, 1701–14, last of the general European wars caused by the efforts of King Louis XIV to extend French power. The conflict in America corresponding to the period of the ...Qatar
(Encyclopedia)CE5 Qatar or Katar both: kŭˈtər, gŭ–, kətärˈ [key], officially State of Qatar, independent emirate (2015 est. pop. 2,482,000), c.4,400 sq mi (11,400 sq km), E Arabia, coextensive with the ...opera
(Encyclopedia)opera, drama set to music. In the early part of the 20th cent. the foremost operatic composer was Richard Strauss. Although influenced by Wagner, he composed operas with even richer and more stunnin...Czechoslovakia
(Encyclopedia)CE5 Czechoslovakia chĕsˈkōslōvĕnˌskō [key], former federal republic, 49,370 sq mi (127,869 sq km), in central Europe. On Jan. 1, 1993, the Czech Republic and the Slovak Republic (see Slovaki...Obama, Barack
(Encyclopedia)Obama, Barack (Barack Hussein Obama 2d), bəräkˈ ho͞osānˈ ōbäˈmə [key], 1961–, 44th president of the United States (2009–17), b. Honolulu, grad. Columbia (B.A. 1983), Harvard Law School ...Maya, indigenous people of Mexico and Central America
(Encyclopedia)Maya mīˈə, Span. mäˈyä [key], indigenous people of S Mexico and Central America, occupying an area comprising the Yucatán peninsula and much of the present state of Chiapas in Mexico, Guatemala...periodical
(Encyclopedia)periodical, a publication that is issued regularly. It is distinguished from the newspaper in format in that its pages are smaller and are usually bound, and it is published at weekly, monthly, quarte...Paraguay, country, South America
(Encyclopedia)CE5 Paraguay pârˈəgwā, –gwī, Span. pärägwīˈ [key], officially Republic of Paraguay, republic (2015 est. pop. 6,639,000), 157,047 sq mi (406,752 sq km), S central South America. Paraguay ...Uruguay , country, South America
(Encyclopedia)CE5 Uruguay yo͝oˈrəgwā, gwī, Span. o͞oro͞ogwiˈ, o͞oro͞owīˈ [key], officially Oriental Republic of Uruguay, republic (2015 est. pop. 3,432,000), 68,536 sq mi (177,508 sq km), SE South Am...Browse by Subject
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