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Transcript
Star Systems and Galaxies Chapter 24 I. Star Systems and Planets A. Star system-groups of two or more stars 1. Binary stars - two stars or double stars a. Eclipsing binary-a system in which one star blocks the light from another II. Planets Around Other Stars A. Astronomers study gravitational effects on stars to see if there is a planet III. Galaxies-classified into three main categories A. Spiral Galaxies - have the shape of twin spirals-have arms like pinwheels 1. The Milky Way (our galaxy) is a spiral galaxy B. Elliptical Galaxies - look like flattened balls 1. Contain little gas and dust, so no new stars formed C. Irregular Galaxies - don’t have regular shapes 3 Types of Galaxies Spiral Elliptical Irregular The Milky Way Flattened balls No regular shape
