The Planets

2. Doesn't mean they are better! Their orbit is beyond Earth's orbit
5. The two moons of Mars are shaped like this
8. planets whose orbit is within the Earth's orbit around the sun
10. there are this many giant planets in our solar system
11. made of solid material like dust, ice, or moonlets- these orbit around a celestial object
13. an estimated distance from a planet or object in a solar system beyond which the gravitational force of the larger body isn't typically strong enough to prevent the gravity of smaller particles from forming a moon.
15. Jupiter and Saturn
16. Neptune and Uranus

1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
3. the largest planet in our solar system
4. Mars and Mercury have very little of this, which is why they are so cold
6. another word for the giant planets
7. the type of telescope invented by Galileo
9. a planet that is made of rock
12. Where Galileo proved his theory of falling bodies
14. The glass in the eyepiece of Galileo's telescope had this shape