AST 101 Lecture Notes - Lecture 19: Density Wave Theory, Radiography, Signify
9 Dec 2017
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A large glowing ball of gas that generates heat and light through nuclear fusion. An interstellar cloud of gas and dust. If you know the mass of a star you know it"s life. Galaxy - a great island of stars in space all held together by gravity orbiting a common center. There can be a cluster of galaxies. There are a lot of voids between galaxies in the universe. Dusty clouds absorb light and frey our vision. Structures are supported with the balance of gas and pressure. Stars in the disk all orbit in the same direction, some stars move up and down to create the thickness (1000 light years) of the disk. Travel high above and very below the disk in random orientations. The sun"s orbital motion tess us mass within the sun"s orbit. The orbital speed (v) and radius (r ) of an object on a circular orbit around the.
