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physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

Orthodox Eastern Church

(Encyclopedia)Orthodox Eastern Church, community of Christian churches whose chief strength is in the Middle East and E Europe. Their members number some 300 million worldwide. The Orthodox agree doctrinally in acc...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...

contemporary art

(Encyclopedia)contemporary art, the art of the late 20th cent. and early 21st cent., both an outgrowth and a rejection of modern art. As the force and vigor of abstract expressionism diminished, new artistic moveme...

international law

(Encyclopedia)international law, body of rules considered legally binding in the relations between national states, also known as the law of nations. It is sometimes called public international law in contrast to p...

satellite, artificial

(Encyclopedia)CE5 A. Nimbus weather satellite B. Syncom communications satellite satellite, artificial, object constructed by humans and placed in orbit around the earth or other celestial body (see also space ...

psychology

(Encyclopedia)psychology, science or study of the thought processes and behavior of humans and other animals in their interaction with the environment. Psychologists study processes of sense perception, thinking, l...

Rhode Island, state, United States

(Encyclopedia)CE5 Rhode Island, smallest state in the United States, located in New England; bounded by Massachusetts (N and E), the Atlantic Ocean (S), and Connecticut (W). Until well into the 20th cent. ...

Panama, country, Central America

(Encyclopedia)CE5 Panama pănˈəmäˌ [key], Span. Panamá, officially Republic of Panama, republic (2015 est. pop. 3,657,000), 29,760 sq mi (77,081 sq km), occupying the Isthmus of Panama, which connects Centr...

South Sudan

(Encyclopedia)South Sudan so͞odănˈ [key], officially Republic of South Sudan, republic (2015 est. pop. 11,882,000), 248,777 sq mi (644,329 sq km), E Africa. South Sudan is bordered by Sudan (N), Ethiopia (E), Ke...