1. Black Holes

4. The intense gravitational field left when a giant star collapses

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

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

10. Event Horizon The point at which no light can escape

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

13. Galaxies

14. Galaxy A large assembly of stars and nebulae

15. Group of Galaxies

16. The Milky Way Our galaxy Flat disk with spiral arms

18. Three Types of Galaxies

19. Elliptical Oval shaped Most common type of galaxy found

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

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

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

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

27. Small and faint therefore hard to see

29. Quasars

30. Small, powerful source of energy thought to be cores of distant spiral galaxies

31. They emit radio waves and bright light

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