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Intro to Astronomy Chapter 1 Notes.docx - Chapter 1: A...

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Chapter 1: A Modern View of the UniverseDefinition of Astronomy:is observational scientific study of theuniverse and its contents.Definition of Astrophysics:is the combination of astronomy withtheoretical understanding of the processes takingplace in astronomical objects.LEARNING GOALS:1.1 The Scale of the UniverseWhat is our Place in the Universe?How big is the Universe?1.2 The History of the UniverseHow did we Come to be?How do our Lifetimes Compare to the Age of the Universe?1.3 Spaceship EarthHow is Earth Moving Through Space?How do Galaxies Move within the Universe?1.1 The Scale of the UniverseFor most of the human history, our ancestors imagined Earth to be stationary at the center of arelatively small universe. We now know that Earth is a planet orbiting a rather average star (theSun) in a rather typical galaxy in a vast universe.Definition of Solar System:A star (sometimes more than one star) and all the objects that orbitit. Solar system can also be known as the star system.Earth is a planet in our solar system. The solar system consists of the Sun, the planets (inorder, Mercury, Venus, Earth, Mars. Jupiter, Saturn, Uranus, and Neptune) and theirmoons, and countless smaller objects that include rocky asteroids and icy comets.Definition of Galaxy:A great island of stars in space, containing millions, billions, or eventrillions of stars, all held together by gravity and orbiting a common center.

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Solar System, Planet, Definition of Astrophysics, Definition of Solar System

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