NATS 1745 Lecture Notes - Lecture 12: Grote Reber, Radio Astronomy, Radio Wave
17 Jul 2017
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Document Summary
Make sure that you understand why radio waves have each of these advantages. They can be detected on earth both day and night, as well as through clouds- sun produces little radio emission but high visible light. They are easily detected with ground level telescopes- radio waves are so long they can penetrate our atmosphere therefore we don"t see space telescopes. They reflect off of metallic most metallic surfaces, unlike visible light- easy to construct and cheaper. Not absorbed by interstellar dust- when a radio wave encounters a dust particle, it just zips right past it, doesn"t get blocked by it. Karl jansky ( father of radio astronomy ) was the first person to detect radio emission from our galaxy. The emission detected by jansky was coming from our galaxy (milky way). Reber found radio emission from discrete sources: describe the process that is producing the 21-cm radio emission in our galaxy.
