There are many technologies being implemented in telescopes like radio technology, optical technology etc. Re: How do radio telescopes form raster images? The 140' telescope, pictured here, is pointing at an object in the universe. They come in a variety of shapes and sizes, reflecting the need to be able to detect a great breadth of radio waves across many wavelengths. Then the image from the telescope is recorded on film or as a digital image. Radio waves emitted by that object hit the surface of the dish, and bounce. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media. This is a technique known as very long baseline interferometry. In 1931 a Bell Labs engineer named Karl Jansky was handed the job of detecting the source of radio static that was interfering with shortwave communications. A telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Ideally, an array of many radio telescopes at different separation distances would work together to optimize the effective size of the collection area as well improve the resolution of the instrument. Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. We use a giant radio telescope like the one in Arecibo to collect the signals, which are very weak because they’ve traveled millions of light-years or more. Many Thanks.  — Josh. Radio telescopes work by gathering electromagnetic radiation that consists of longer wavelengths than the light that is captured in a standard telescope. Image: Bryon Tong Minh, Wikimedia Commons. The antenna gathers the minute amount of radio frequency energy from the sky and transforms it to a tiny electrical current which, after much processing, we can then measure. As far as I know, there is no "optical radio telescope". All elements must be properly powered and must be connected to each other with special data cables provided with the radio telescope. Most radio telescope antennas are quite large due to the resolving power desired. Radio astronomy today owes a debt to two huge breakthroughs in the past. Radio telescopes look like this. 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Whether we are talking about a cell phone, a baby monitor, a cordless phone or any one of the thousands of other wireless technologies, all of them … The first radio antenna used to identify an astronomical radio source was built by Karl Guthe Jansky, an engineer with Bell Telephone Laboratories, in 1932. How do modern telescopes work? The radio telescopes work together to scan objects in order to create an image electronically, usually utilizing different colors as representations of different intensities. This means that the angular resolution of a radio telescope can be improved by increasing the diameter of the aperture. Jansky was assigned the job of identifying sources of static that might interfere with radio telephone service. A radio telescope is a form of radio receiver used in astronomy. radio telescope operating in (say) the 1 cms band presumably there is some matrix of receivers 1 cms apart to form a raster image, to save them having to do each pixel separately to form a high res image, is that how they work? Jeffs: Radio telescopes use very large antennas to receive naturally generated radio waves from objects. This then allows us to measure the intensities of the discrete emission and absorption frequencies from atoms and molecules, which in-turn allows us to study the properties … There are, separately, optical telescopes (which work with visible light), and radio telescopes (which work with radio waves). It was mounted on a turntable that allowed it to rotate in any direction, earning it the name "Ja… But how do radio telescopes actually work? 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