What is the use of radio telescope?

Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.

Why is a radio telescope important?

Because many astronomical objects emit radiation more strongly at longer wavelengths than at visible-light wavelengths, radio telescopes can show us things about the universe that optical telescopes cannot. Over the last half-century, radio astronomers have used radio telescopes to make important discoveries.

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