Man's physical universe

xanabras

80 THE UNIVERSE A VAST SYSTEM OF PARTS

12. How is the temperature of stars estimated?

13. Why is the camera of great value in studying the stars?

14. What is the scientific significance of the different instruments used for

measuring the temperatures of the stars?

15. Compare the variations of stars in density and mass.

16. Are collisions between stars likely to be of frequent occurrence? Discuss.

17. What is the estimated number of stars in our galaxy?

18. What form does our galaxy take?

19. What is the significance of the Milky Way?

20. What is the size of our galaxy?

21. What is thought to be the nature of a nebular cloud?

22. Give one theory to explain the low-temperature periods in the earth's

history.

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