An instrument designed to detect and study radio waves from celestial objects, typically consisting of a large dish antenna and sensitive receivers. Radio telescopes can observe through clouds and during daylight, revealing phenomena invisible to optical telescopes.
Compound of 'radio' from Latin 'radius' (ray, beam) and 'telescope' from Greek 'tele' (far) and 'skopein' (to see). The term emerged in the 1940s following Karl Jansky's accidental discovery of cosmic radio waves in 1933, as astronomers realized they could 'see' the universe using radio frequencies rather than visible light.
Radio telescopes opened up an entirely invisible universe - they revealed phenomena like pulsars, quasars, and the cosmic microwave background that would have remained forever hidden to optical astronomy! The first radio telescope was built from spare parts and detected radio waves from the center of our galaxy, launching a revolution that discovered most of the universe's exotic objects.
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