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SOS

(Encyclopedia)SOS, code letters of the international distress signal. The signal is expressed in International Morse code as … — — — ……———… (three dots, three dashes, three dots). This c...

space science

(Encyclopedia)space science, body of scientific knowledge as it relates to space exploration; it is sometimes also called astronautics. Space science draws on the conventional sciences of physics, chemistry, biolog...

Maranhão

(Encyclopedia)Maranhão mərənyouNˈ [key], state (1996 pop. 5,218,442), 126,897 sq mi (328,663 sq km), NE Brazil, on the Atlantic Ocean. The capital is São Luís (also known as Maranhão). Agriculture and livest...

Kalam, A. P. J. Abdul

(Encyclopedia)Kalam, A. P. J. Abdul (Avul Pakir Jainulabdeen Abdul Kalam), 1921–2015, Indian scientist and political leader, studied St. Joseph's College, Tiruchirappalli (grad. 1954), Madras Institute of Technol...

Nashua

(Encyclopedia)Nashua năshˈo͞oə [key], city (1990 pop. 79,662), seat of Hillsborough co., S N.H., on the Merrimack and Nashua rivers near the Mass. line; settled c.1655, inc. as a city 1853. Because of the avail...

Huygens, Christiaan

(Encyclopedia)Huygens, Christiaan krĭsˈtyän hoiˈgəns [key], 1629–95, Dutch mathematician and physicist; son of Constantijn Huygens. He improved telescopic lenses and discovered (1655) a satellite of Saturn a...

cable television

(Encyclopedia)cable television, the transmission of televised images to viewers by means of coaxial cables. Cable systems receive the television signal, which is sent out over cables to individual subscribers, by a...

communication

(Encyclopedia)communication, transfer of information, such as thoughts and messages, as contrasted with transportation, the transfer of goods and persons (see information theory). The basic forms of communication a...

communications industry

(Encyclopedia)communications industry, broadly defined, the business of conveying information. Although communication by means of symbols and gestures dates to the beginning of human history, the term generally ref...

gamma-ray astronomy

(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...