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7.3 star groups

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  • 1. Star Groups Mr. SilvaAg Earth Science
  • 2. StarsThe visible stars you see at night are only some of the stars in our galaxy.Most stars seem to be single stars, but in actuality they are mostly doubles and triples.  1/3 are doubles  ¼ are singles
  • 3. ConstellationsConstellations are patterns of starts.They may look like they are close together but really they are extremely far apart.We recognize 88 different constellations.Named after gods, heroes or fierce animals.
  • 4. GalaxiesThe major components of the universe are galaxies.They are large groups of stars bound together by gravitational attraction.Made up of millions of stars, dust clouds and gases.Estimated 50 billion and 1 trillion galaxies in the universe.We live in the Milky Way Galaxies.
  • 5. Types of GalaxiesSpiral Galaxy: has a nucleus or bright center with flattened arms that spiral around the nucleus.
  • 6. Types of GalaxiesElliptical Galaxy: They are very bright centers and do not have spiral arms. Have no young stars and contain very little dust and gas.
  • 7. Types of GalaxiesIrregular Galaxy: has no particular shape. They are very small and faint. Very little gravitational pull.
  • 8. The Milky WayOur galaxySpiral galaxyHas a diameter of 100,000 light yearsOur sun is about 30,000 light years from the center.Revolves at a speed of 250km/s.Takes 200 million years to make one revolution.
  • 9. Formation of the UniverseThe big bang theory- matter was all concentrated in an extremely small volumeOccurred 12-15 billion years ago.Galaxies are continuing to move outward.
  • 10. Formation of the UniverseThe big bang theory- matter was all concentrated in an extremely small volumeOccurred 12-15 billion years ago.Galaxies are continuing to move outward.