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16.5 NOTES What is a radio telescope? Objective: Explain how a radio telescope works The reason why we do not see stars during the day is because the Sun is the closest star to the Earth and outshines the rest of them. On rainy nights, clouds hide the light from the stars, making it impossible to even see them with a refracting or reflecting telescope. Stars send out visible light as well as all forms of electromagnetic radiation. A radio telescope can receive radio waves from space. It can also find stars during the day or when there are clouds. In 1932, an American engineer named Karl Jansky, heard the first radio signals from space. These waves were coming from our galaxy, the Milky Way. Grote Reber built a radio telescope with an antenna. He was able to make the first radio map of the Milky Way. The antenna collects and focuses radio waves given off by stars and other objects in space. These waves are then transmitted to a receiver. There are three advantages of using radio telescopes 1. They can detect some objects that refracting and reflecting telescopes cannot see. 2. They can be used in any kind of weather, even traveling through clouds. 3. They can be used during the day when stars other than the Sun are not visible.