Solar System

2. a unit of measurement equal to 149.6 million kilometers
6. the collection of eight planets and their moons in orbit around the sun
7. the planet closest to the sun and one of the hottest planets
8. an oval shape, which may be elongated or nearly circular
9. between the orbits of Mars and Jupiter, where many asteroids are found
10. the path of an object as it revolves around another object in space
13. a planet whose orbit lies outside the asteroid belt
14. a celestial body resembling a small planet but lacking certain technical criteria
15. a celestial body moving in an elliptical orbit around a star

1. the fourth planet in order from the Sun
3. the planet eighth in order from the Sun
4. a force that moves rocks and other materials; the force that pulls objects toward each other
5. the name often given to the four inner planets
11. a planet whose orbit lies within the asteroid belt
12. the name often given to the first four outer planets: Jupiter, Saturn, Uranus, and Neptune