Astronomy Crossword

2. an object that orbits a more massive object
4. space and all the matter and energy in it
7. the term to describe the inner planets
11. millions or billions of stars held together in a group by their own gravity
12. a satellite in which people can live and work for long periods of time
13. the largest planet in our solar system
15. the fourth planet in our solar system
17. the model of our solar system with the Sun as its center
19. the path of an object in space as it moves around another object due to gravity

1. the term to describe the outer planets
3. the ONLY star in our solar system
5. the only planet that can sustain life
6. the force that objects exert on each other because of their mass (amount of matter)
8. the Sun, the planets, and various other objects
9. large objects which orbit the Sun
10. a dwarf planet
11. the model of our solar system with the Earth as its center
14. the closest planet to the Sun
15. a natural satellite that orbits the Earth
16. the last planet in our solar system
18. the resistance of any physical object to any change in its state of motion