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-->Cygnus A

Brightest cosmic source of radio waves in the sky, lying in the constellation Cygnus, about 700 million light-years from earth. Because of its peculiar appearance, it was once thought to be two galaxies colliding, but this would not account for its immense energy output. Recent observations suggest that it is a relatively nearby quasar whose central source is heavily obscured by a surrounding dust cloud. See also active galactic nucleus.


Vygotsky
Soviet psychologist. He studied linguistics and philosophy at the Univ. of Moscow before becoming involved in psychological research. While working at Moscow's Institute of Psychology 1924-34, he became a major figure in post-revolutionary Soviet psychology. He studied the role of social and cultural factors in the making of human consciousness; his theory of signs and their relationship to the development of speech influenced such psychologists as A. R. Luria and J. Piaget. His best-known work, Thought and Language (1934), was briefly suppressed as a threat to Stalinism. He died of tuberculosis at 38.

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