Chapter 1 astronomy terms

Chapter 1 astronomy terms - Chapter 1: Our Place in the...

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Chapter 1: Our Place in the Universe 1.1 Our Modern View of the Universe solar system (or star system) : consists of a star (sometimes more than one star) and all the objects that orbit it. 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. galaxy: a huge collection of anywhere from a few hundred million to more than a trillion stars, all bound together by gravity. Local Group: the group of about 40 galaxies to which the Milky Way belongs. galaxy clusters: a collection of a few dozen or more galaxies bound together by gravity; smaller collections of galaxies are simply called groups. superclusters: superclusters consist of many clusters of galaxies, groups of galaxies, and individual galaxies and are the largest known structures in the universe. Local Supercluster: the supercluster of galaxies to which the Local Group belongs. universe: the sum total of all matter and energy. Big Bang: the name given to the event thought to mark the birth of the universe Big Bang Theory: the scientific theory of the universe’s earliest moments, stating that all the matter in our observable universe came into being at a single moment
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This note was uploaded on 04/30/2008 for the course ASTRO 1 taught by Professor Butterwoth during the Spring '07 term at GWU.

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Chapter 1 astronomy terms - Chapter 1: Our Place in the...

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