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stellar populations

(Encyclopedia)stellar populations, two broadly contrasting distributions of star types that are characteristic of different parts of a galaxy. Population I stars are young, recently formed stars, whereas population...

technetium

(Encyclopedia)technetium tĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,200℃; b.p. 4,877�...

proton

(Encyclopedia)proton, elementary particle having a single positive electrical charge and constituting the nucleus of the ordinary hydrogen atom. The positive charge of the nucleus of any atom is due to its protons....

sulfur

(Encyclopedia)CE5 Sulfur crystals sulfur or sulphur sŭlˈfər [key], nonmetallic chemical element; symbol S; at. no. 16; interval in which at. wt. ranges 32.059–32.076; m.p. 112.8℃ (rhombic), 119.0℃ (mon...

chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

diary

(Encyclopedia)diary [Lat.,=day], a daily record of events and observations. As distinguished from memoir (an account of events placed in perspective by the author long after they have occurred), the diary derives i...

Kushner, Tony

(Encyclopedia)Kushner, Tony ko͝oshˈnər [key], 1956–, American playwright, b. New York City. He was a little-known off-Broadway playwright with several interesting works, e.g., Yes, Yes, No, No (1985) and A Bri...

Koestler, Arthur

(Encyclopedia)Koestler, Arthur kĕstˈlər [key], 1905–83, English writer, b. Budapest of Hungarian parents. Koestler spent his early years in Vienna and Palestine. He was an influential Communist journalist in B...

land

(Encyclopedia)land, in law, any ground, soil, or earth regarded as the subject of ownership, including trees, water, buildings added by humans, the air above, and the earth below. Private ownership of land does not...

Resnais, Alain

(Encyclopedia)Resnais, Alain älăNˈ rānāˈ [key], 1922–2014, French filmmaker. Although not an official member of the French cinema's New Wave movement, he shared its innovative and personal approach to style...