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1.1b classification of galaxies
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- 2. ACHIEVEActivity – DirectInstructionConversation – 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.
- 3. ExpectationWrite down thingson your notebook starting from the next available space.Poster will be turned in today.
- 4. Classification of GalaxiesIrregularGalaxiesElliptical GalaxiesSpiral Galaxies
- 5. Irregular GalaxiesIrregular galaxieshave 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.
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- 10. Spiral GalaxiesSpiral galaxieshave three main components: a central bulge, disk, and halo
- 11. Spiral GalaxiesThe bulgeis a spherical structure found in the center of the galaxy. This feature mostly contains older stars.
- 12. Spiral GalaxiesThe diskis 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.
- 13. Spiral GalaxiesThe haloof 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.
- 14. Spiral GalaxiesGlobular clustersare spherical concentrations of stars typically 100 light years across and containing thousands of stars. Globular clusters 10 billion years oldformed when the galaxy was still forming.
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- 19. Elliptical GalaxiesElliptical galaxiesare shaped like an elongated sphere.The light is smoothThe surface brightness decreases as you go farther out from the center.Elliptical galaxies have no particular axis of rotation.
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