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Other Components of the Universe

Other Components of the Universe. Section 9.6. Star Clusters. A group of stars held together by gravity Open star clusters – collections of 6 to 1000s of younger stars Globular clusters – ball shaped collection of 1000s to 1000000s of very old stars. Galaxies.

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Other Components of the Universe

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  1. Other Components of the Universe Section 9.6

  2. Star Clusters • A group of stars held together by gravity • Open star clusters – collections of 6 to 1000s of younger stars • Globular clusters – ball shaped collection of 1000s to 1000000s of very old stars

  3. Galaxies • Collections of millions/billions of stars, planets, gas and dust measuring up to 100 000 ly across. • Come in different shapes/sizes • Elliptical – spherical to flat oval shape • Spiral – spinning pinwheels • Lenticular – central bulge surrounded by flattened disc • Irregular – no definite shape

  4. The Milky Way • 2 spiral arms, central bulge of old stars, disc of newer stars around the bulge • Our solar system is located on the inner edge of one of the spiral arms (26 000 ly from the inner core). • There is a supermassive black hole at the center

  5. Quasars – Powerhouse of Energy • They are distant, young galaxies that emit large amounts of energy produced by a supermassive black hole at its centre. • The central region is more luminous than normal – they look like stars though a telescope

  6. Today’s Tasks • Pg. 387 Classifying Galaxies • Complete #1, A-E (yes…E will be homework) • Pg. 391 #1, 6, 8

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