A radio telescope is a telescope that uses radio waves to observe astronomical objects. Radio telescopes are the largest telescopes in the world, and they are used to study some of the most distant objects in the universe.
Radio waves are a type of electromagnetic radiation, and they are produced by astronomical objects such as stars and galaxies. When these objects emit radio waves, they can be detected by radio telescopes.
Radio telescopes are usually much larger than optical telescopes, because they need to be able to collect more light. The largest radio telescope in the world is the Arecibo Observatory in Puerto Rico, which has a dish diameter of 305 metres (1,000 feet).
Radio astronomy is the study of astronomical objects that emit radio waves. Radio astronomers use radio telescopes to study things like pulsars, quasars, and black holes. They also use them to map out large structures like galaxies and clusters of galaxies.