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AST201 Lecture 1[1]~ - AST201 Lecture 1 Tutorial Tuesdays...

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AST201 May 17, 2011 Lecture 1 - Tutorial: Tuesdays HA 401 Where are we? - Our Address: Earth, Solar System, Milky Way Galazyt, Local Group, Local Supercluster, Universe Relative Sizes of Objects in the Solar System: - Terrestrial Planets (made of rocks) – Earth, Venus, Mars, Mercury - Jupiter, Saturn, Uranus, Neptune - Jupiter is 10 times in diameter of Earth’s Relative Size of Stars: - Sun is 100 times in diameter of Earth’s - Antares, Betageuse - Sun is low mass small star Relative Sizes of Galaxies: - Milky Way is midsized Galaxy - Andromeda, slightly bigger, is our neighbor - Virgo A is extremely huge - Whirlpool Galaxy, Themglum Galaxy, Nebeula Minor Relative Distances: - Galaxies are relatively close to each other, Stars are relatively far for their size and therefore galaxies often collide Common Distance Units Used in Astronomy: - 1 AU = average distance between the Earth and Sun (used within the Solar System)
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- 1 ly = distance light travels in 1 year (used to describe within the Milky Way Galaxy) -
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