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Section 15-4 PowerPoint Presentation
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Section 15-4

Section 15-4

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Section 15-4

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  1. Section 15-4 Star Systems and Galaxies

  2. Star systems and Planets • More than half of all stars are members of groups of two or more stars called star systems

  3. Star systems and Planets • Double and Triple Stars • Binary System – two or more stars • Eclipsing Binary System – where one star covers the other • Found by looking at star “wobble” from gravitational pull of other star • Planets around other stars • Also found by looking at “wobble” caused by gravity

  4. Galaxies • Three types of Galaxies: spiral, elliptical, and irregular • Spiral • Pinwheel shape • Elliptical Galaxies • Shaped like a flattened ball • Irregular Galaxies • No particular shape, usually a cloud (very large nebula)