CAS CC 111 Chapter Notes - Chapter 1: Radio Telescope, Cosmic Ray, Cosmic Background Explorer
11 Dec 2016
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Ancient views: plato and aristotle thought that the earth was the center of the universe and that celestial objects rotated on crystal spheres. Heliocentric (sun in the center of the universe): stellar parallax made ancient astronomers believe that the earth was the center of the. Universe for a long time: copernicus proposed the planets moved in a uniform speed and he put the sun in the center of the universe, explaining why planets wandered2. The wandering effect was caused when planets passed each other while orbiting the sun. Planets appear to move backwards when you pass them at high speeds: kepler discovered that planets moved in an elliptical motion while studying data collected from mars. He then stated that the sun was in one of the focuses of the ellipse. 1 retrograde motion: planets move east, but occasionally they slow down and reverse their path.
