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ASTR 1110 book summary - ch.1.1

ASTR 1110 book summary - ch.1.1 - Astronomy Book Notes 1.1...

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Astronomy – Book Notes 1.1 Our Modern View of the Universe - geocentric universe – Earth-centered universe - Solar System : consists of the sun and all the objects that orbit it o The planets and their moons o Asteroids – chunks of rock o Comets – balls of ice o Tiny particles of interplanetary dust * Sun is a star - Galaxy: great island of stars in space, containing from a few hundred million to a trillion or more stars. o Milky Way: Used both as the name of our Galaxy and to refer to the band of light we see in the sky when we look into the plane of the Milky Way Galaxy. Milky Way Galaxy Relatively large Contains more than 100 billion stars Our solar system is located a little over halfway from the galactic center to the edge of the galactic disk o Local Group : The group of about 40 galaxies to which the Milky Way Galaxy belongs Our milky way Is one of the two largest - Galaxy Clusters: Groups of galaxies with more than a few dozen members - Superclusters:
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