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1.  Name the nine planets in order from the Sun.

2.  What gravitational force keeps the planets in their orbits?

3.  What type of timetable is used to keep track of the movement and location of the planets?

4.  What is an orbital period?

5.  Why do some planets appear at times to be going backward in their orbits?

6.  Which two planets are closest to Earth?

7.  What information did Mariner 10 provide us about mercury?

8.  What have recent space probes revealed about Venus?

9.  When do we usually see Venus best, and what do we call it at these times?

10.  What planet is called the "red planet"?

11.  Answer BOTH of the following questions in the space below:

A)  What are the canali?

B)  What happened to the canali theory?

12.  How far from the Sun is Mars?

13.  Compare Mars with Earth as to diameter, atmosphere, and other environmental factors.

14.  What important discovery about Mars was allegedly made on Earth in 1996?

15.  Which planet is the largest of our solar system?

16.  Why is space travel to Jupiter by astronauts not possible in the foreseeable future?

17.  What is the probable composition of Jupiter?

18.  Answer BOTH of the following questions in the space below:

A)  What is the great Red Spot of Jupiter?

B)  Why is the Red Spot of particular interest to scientists?

19.  What were the significant discoveries made about Jupiter by the "Galileo" spacecraft and probe in the mid-1990s?

20.  Why were the explorations of Saturn by "Pioneer 11" and the two Voyager spacecraft of such importance?

21.  How were the planets Neptune and Pluto discovered?

22.  What is unique about the magnetic fields of Uranus and Neptune?