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Black holes

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Transcript

  • 1. BlackHoles
  • 2. Black HolesThe intensegravitational field leftwhen a giant starcollapses
  • 3. It is called a blackhole because noteven light canescape
  • 4. Photon SphereThe outer edgewhere light bends butis still escapable
  • 5. Event HorizonThe point at which nolight can escape
  • 6. SingularityThe shrunken startoo small to bemeasured but withindefinite density
  • 7. Galaxies
  • 8. GalaxyA large assembly ofstars and nebulae
  • 9. Group of Galaxies
  • 10. The Milky WayOur galaxyFlat disk with spiralarms
  • 11. Three Types of Galaxies
  • 12. EllipticalOval shapedMost common typeof galaxy found
  • 13. Contains little gasand dustMost are dim anddifficult to see
  • 14. SpiralDense center withspiral armsBright and easy tosee
  • 15. Contains largeamounts of gas anddust – alwaysproducing new stars
  • 16. IrregularNo specific shapeContains largeamounts of gas anddust
  • 17. Small and fainttherefore hard to see
  • 18. Quasars
  • 19. QuasarsSmall, powerfulsource of energythought to be coresof distant spiralgalaxies
  • 20. They emit radiowaves and brightlight
  • 21. This powerpoint was kindly donated towww.worldofteaching.comhttp://www.worldofteaching.com is home to over athousand powerpoints submitted by teachers. This is acompletely free site and requires no registration. Pleasevisit and I hope it will help in your teaching.