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Section 15-4

Section 15-4. Star Systems and Galaxies. Star systems and Planets. More than half of all stars are members of groups of two or more stars called star systems. Star systems and Planets. Double and Triple Stars Binary System – two or more stars

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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)

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