Man's physical universe

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THE UNIVERSE A VAST SYSTEM OF PARTS

11. Describe some of the unusual ajiKJitions of theoretical life on the moon.

12. Explain the phases of the moon.

13. How do the inner planets differ from the outer planets?

14. How is it known that Mercury has no atmosphere?

15. Which is the most distant planet?

16. E.xplain why Lowell believed in the existence of a ninth planet even before

it had been discovered.

17. What causes eclipses?

18. What is the average duration of a total eclipse?

19. If I^luto and Jupiter moved with the same velocity, which would have the

greater momentum, and why?

20. Would an object fall more rapidly toward the earth or toward the sun? W'hy?

21. Why does the moon appear to be larger than, or nearly the same size as, the

sun?

22. How does a star differ from a planet?

23. Why can Mercury be observed only at twilight or at dawn?

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