NATS 1745 Study Guide - Planetary Nebula, Absorption Spectroscopy, Parsec

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7 Feb 2014
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The stars had no motion of their own. Stars do have motion in space but because they are so distant, they appear to barely move. Ptolemy"s ancient star catalogues and he found 3 moving stars. The 3 stars were moving in their own directions. Change in co-ordinates of those stars couldn"t be due to earth"s precession. This suggested that the stars had their unique motion across the sky. The distance of an object with a parallax of 1 arcsecond. (note: the specific values in km aren"t necessary here). Contain charged particles which are moving around and when charged particles move, they create electric energy fields: describe how a wave from a bright blue light source is different from a wave from a faint red light source. The blue light source is hotter as it has shorter wavelength and is more energetic as compared to red light sources.