ASTR 105 Lecture Notes - Lecture 3: Local Group, Solar System, Coordinate System

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25 May 2018

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Lab AST 105 Lecture Notes 3:

• Our Celestial "Adress"

• 1.earth

• 2. Solar system

• 3. Milky Way Galaxy

• 4. Local Group of Galaxies

• 5. Universe

• Big Bang theory

• creation and expansion of the universe was the result of an explosion 13.8 billion years

ago

• celestial sphere

• night sky

• constellations

• officially recognized star patterns

• asterism

• star pattern within a constellation

• ecliptic

• path the Sun and planets follow through the sky (solar system)

• Zodiac

• constellations which the ecliptic passes through

• Zenith

• point directly overhead

• Magnitude

• star brightness

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