1. The Earth has how many natural satellites? Four Two One None

2. Of the nine planets in our Solar System, The Earth is? The seventh largest The third largest The tenth largest The fifth largest

3. Olympus Mons is on what planet? Earth Jupiter Venus Mars

4. If you could find a tub of water large enough, and put all the planets in it, which one would float? None would float Neptune Pluto Saturn

5. Earth and Venus are the only planets with known active volcanoes. True False

6. Titan is the only known satellite (moon) to have an atmosphere. True False

7. The main asteroid belt is between the planets Jupiter and Saturn. True False

8. Which is the brightest planet (when visible) in Earth's night (or morning) sky? Venus Pluto Mercury Jupiter

9. The Moon's gravity is what percentage of the Earth's? One fourth One eighth One third One sixth

10. The planet Pluto has a circular orbit. True False