GLGY 209 Lecture Notes - Lecture 3: Milky Way, Big Bang (South Korean Band), Galactic Coordinate System
27 May 2016
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Document Summary
Our galaxy is known as the milky way galaxy. It is an agglomeration of over 200 million stars. Other components of the mw: planets gravitating around the stars, nebulae, interstellar dust, etc. All of them gravitate around the centre of the galaxy, which consists of closely- spaced stars and dense dust. Mass: ~ 750 billion times the mass of sun if not more. 22,000 light years from the center of the galaxy. Mw had lens shape when seen in edge view. The galaxy has four arms: perseus, cygnus-orion, sagittarius and centaurus. Milky way position in the known universe. The american astronomer vesto slipher, who studied the fingerprints in the galaxy light, observed (1914) that distant galaxies moving away from the earth present a distinct. Those very few that move towards us present a clear blue-shift . It was the american astronomer edwin hubble who observed (1929) that the farther away a galaxy is, the faster it is receding.
