Unit 3/Solar System

5. Seventh planet out from the Sun
6. A force of attraction between objects that is due to their masses, and that increases in proportion to their masses
7. to move around another object in a circular path
9. A collection of stars, dust, and gas bound together by gravity
11. Mercury, Venus, Earth, Mars
13. a small, rocky body that travels through space
14. A model of the universe in which Earth is at the center of the revolving planets and stars.
16. "The Red Planet," with four moons and an iron-rich crust
18. Farthest-out major planet
19. A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit.
21. the sun and all of the planets and other bodies that travel around it
22. a spherical region that surrounds the solar system and contains billions of comets
23. A meteoroid that passes through the atmosphere and hits Earth's surface.
26. Rings, the Great Red Spot, and many moons.

1. A region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice
2. Dwarf planet found in the Asteroid Belt
3. Jupiter, Saturn, Uranus, Neptune
4. Collection of asteroids and other debris located between Mars and Jupiter
8. All of space and everything in it
10. A model of the solar system in which Earth and the other planets revolve around the sun
12. Second-largest planet in Solar System; large ring systemq
15. A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere.
16. Closest planet to the Sun
17. to spin on an axis
20. any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)
24. Planet, 1930-2006
25. "Earth's Twin," except for the enormous air pressure and toxic atmosphere