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1.1b classification of galaxies

1.1b classification of galaxies






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    1.1b classification of galaxies 1.1b classification of galaxies Presentation Transcript

    • Classification of Galaxies
      Chapter 16.1b
      Activity – Direct Instruction
      Conversation – Voice Level 2. Limit to topic.
      Help – Raise hand until recognized.
      Integrity – If you go behind in note taking, raise your hand and ask for a “repeat or slow down.”
      Effort – Sit up eyes on screen, handout, or your notes. Write notes about material presented.
      Value – Presentation will help you more fully understand Galaxy Classificaton.
      Efficiency – Glue handouts and notes in notebook for easy access.
    • Expectation
      Write down things on your notebook starting from the next available space.
      Poster will be turned in today.
    • Classification of Galaxies
      Irregular Galaxies
      Elliptical Galaxies
      Spiral Galaxies
    • Irregular Galaxies
      Irregular galaxies have no regular or symmetrical structure.
      They have regions of elemental hydrogen gas, and many young stars.
      They have large amounts of dusts from which stars are born.
    • Irregular Galaxies
    • Irregular Galaxies
    • Irregular Galaxies
    • Irregular Galaxies
    • Spiral Galaxies
      Spiral galaxies have three main components:
      a central bulge,
      disk, and
    • Spiral Galaxies
      The bulge is a spherical structure found in the center of the galaxy.
      This feature mostly contains older stars. 
    • Spiral Galaxies
      The disk is made up of dust, gas, and younger stars.
      The disk forms arm structures.
      Our Sun is located in an arm of our galaxy, the Milky Way. 
    • Spiral Galaxies
      The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk.
      The halo contains old clusters of stars, known as globular clusters.
    • Spiral Galaxies
      Globular clusters are spherical concentrations of stars
      typically 100 light years across and containing thousands of stars.
      Globular clusters 10 billion years old
      formed when the galaxy was still forming.
    • Spiral Galaxies
    • Spiral Galaxies
    • Spiral Galaxies
    • Spiral Galaxies
    • Elliptical Galaxies
      Elliptical galaxies are shaped like an elongated sphere.
      The light is smooth
      The surface brightness decreases as you go farther out from the center.
      Elliptical galaxies have no particular axis of rotation.
    • Elliptical Galaxies
    • Elliptical Galaxies
    • Elliptical Galaxies
    • Elliptical Galaxies
    • Elliptical Galaxies
    • Hubble’s Classification Scheme
    • Hubble’s Classification SchemePoster