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Black Holes

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Black Holes. Black Holes. The intense gravitational field left when a giant star collapses. It is called a black hole because not even light can escape. Photon Sphere. The outer edge where light bends but is still escapable. Event Horizon. The point at which no light can escape.

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Black Holes

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  1. Black Holes

  2. Black Holes • The intense gravitational field left when a giant star collapses

  3. It is called a black hole because not even light can escape

  4. Photon Sphere • The outer edge where light bends but is still escapable

  5. Event Horizon • The point at which no light can escape

  6. Singularity • The shrunken star too small to be measured but with indefinite density

  7. Galaxies

  8. Galaxy • A large assembly of stars and nebulae

  9. Group of Galaxies

  10. The Milky Way • Our galaxy • Flat disk with spiral arms

  11. Three Types of Galaxies

  12. Elliptical • Oval shaped • Most common type of galaxy found

  13. Contains little gas and dust • Most are dim and difficult to see

  14. Spiral • Dense center with spiral arms • Bright and easy to see

  15. Contains large amounts of gas and dust – always producing new stars

  16. Irregular • No specific shape • Contains large amounts of gas and dust

  17. Small and faint therefore hard to see

  18. Quasars

  19. Quasars • Small, powerful source of energy thought to be cores of distant spiral galaxies

  20. They emit radio waves and bright light

  21. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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