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Radio Astronomy

Radio Astronomy Gspace - Hi Friends, Great Welcome to Our G space Education Platform. Today Let we all know the interesting information about " Radio Astronomy ” When astronomers use large telescopes to probe the Universe, the faint light they gather may have come from objects millions or billions of light years away. When you listen to your radio, use a mobile phone or watch TV, you are using a device that receives radio waves. The difference in radio waves is that they have a longer wavelength and are lower in frequency than visible light. They also carry less energy. Visible light is energetic enough to help plants produce their own food through photosynthesis. Radio waves are far weaker than this so we need electronic amplifiers to help us boost their signal. Any electromagnetic with a wavelength greater than 1 mm is a radio wave. Radio waves were first detected from space in the 1930s but few scientists took the discovery seriously. The development of radar in the Second World War led to improvements in antennas and electronics. How are Radio Waves Produced? All the matter around us is made of atoms. Atoms have in turn are made of sub-atomic particles, with electrons orbiting the nucleus comprised of protons and neutrons. When charged particles such as electrons and protons accelerate by changing their speed or direction, they emit electromagnetic radiation. We can detect many forms of electromagnetic radiation that together comprise the electromagnetic spectrum. The long wavelength, low frequency hence low energy form is called radio waves. What is a Radio Telescope? A radio telescope is simply a telescope that is designed to receive radio waves from space. In its simplest form it has three components: 1. One or more antennas to collect the incoming radio waves. 2. A Yagi antenna, similar to that used for TV reception, can be used for radio astronomy as was the case in the early Dover Heights telescopes. 3. A receiver and amplifier to boost the very weak radio signal to a measurable level. 4. A recorder to keep a record of the signal. In the early days of radio astronomy this was normally a chart recorder that drew a graph on paper in ink. 5. Most radio telescopes nowadays record directly to some form of computer memory disk as astronomers use sophisticated software to process and analyse the data. A replica of the original is now on display at the site. The second is the Parkes radio telescope, star of the film The Dish. This modern type of telescope where several dishes operate together is called an interferometer. Radio interferometers allow astronomers to study objects in finer detail than is possible using a single dish. The larger the total collecting area, the fainter the radio signals that can be detected. Traditional optical astronomy is great for studying objects such as stars and galaxies that emit a lot of visible light. Individual stars, however, are normally only weak emitters of radio waves. We detect radio waves from our Sun only because it is so close although its radio emissions can play havoc with radio communications on Earth when a solar storm erupts. Radio astronomy has detected many new types of objects. These include pulsars, rapidly spinning neutron stars that are collapsed cores of massive stars that have exhausted their fuel. Pulsars beam intense radio beams of radio waves out into space much like the beam from a lighthouse as it rotates. The Parkes radio telescope has been used to find over half of the 1,480 pulsars known. "Thank you for watching this video. Don't forget to subscribe to our channel for more updates."