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supernova

(Encyclopedia)supernova, a massive star in the latter stages of stellar evolution that suddenly contracts and then explodes, increasing its energy output as much as a billionfold. Supernovas are the principal distr...

stellar evolution

(Encyclopedia)CE5 The above Hertzsprung-Russell (H-R) diagram shows the track of stellar evolution for a typical star. After spending much of its life evolving toward or along the main sequence, the star becomes...

musical notation

(Encyclopedia)CE5 Musical notation musical notation, symbols used to make a written record of musical sounds. Two different systems of letters were used to write down the instrumental and the vocal music of anc...

fisheries

(Encyclopedia)fisheries. From earliest times and in practically all countries, fisheries have been of industrial and commercial importance. In the large N Atlantic fishing grounds off Newfoundland and Labrador, for...

Louisiana

(Encyclopedia)CE5 Louisiana ləwēˌzēănˈə, lo͞oēˌ– [key], state in the S central United States. It is bounded by Mississippi, with the Mississippi River forming about half of the border (E), the Gulf o...

Angola

(Encyclopedia)CE5 Angola ăng-gōˈlə [key], officially Republic of Angola (2020 est. pop. 32,870,000), including the exclave of Cabinda, 481,351 sq mi (1,246,700 sq km), SW Africa...

Madagascar

(Encyclopedia)CE5 Madagascar mădˌəgăsˈcär [key], officially Republic of Madagascar, republic (2015 est. pop. 24,234,000), 226,658 sq mi (587,045 sq km), in the Indian Ocean, separated from E Africa by the ...