1.  How many planets are in our solar system? Click here to find out.

2.  The diameter of Luna, Earth's moon, is 3476 km.  What is the diameter of Mercury?  How do they
        compare? Click here to find out.

3.  Venus' atmosphere is composed mostly of what gas?  Click here to find out.

4.  What percentage of the Earth's surface is covered with water?  Click here to find out.

5.  Mars, like many planets, was named after a god.  What is Mars the god of?  Click here to find out.

6.  One of Jupiter's most prominent features is its large red spot.  What is the large red spot?
         Click here to find out.

7.  How many confirmed moons does Saturn have? Click here to find out.

8.  What is the only spacecraft to visit Uranus? Click here to find out.

9.  How did scientists know that Neptune existed, even before it was discovered?
        Click here to find out.

10.  What is the name of Pluto's moon?  Click here to find out.