Astronomy Crossword

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Across
  1. 2. an object that orbits a more massive object
  2. 4. space and all the matter and energy in it
  3. 7. the term to describe the inner planets
  4. 11. millions or billions of stars held together in a group by their own gravity
  5. 12. a satellite in which people can live and work for long periods of time
  6. 13. the largest planet in our solar system
  7. 15. the fourth planet in our solar system
  8. 17. the model of our solar system with the Sun as its center
  9. 19. the path of an object in space as it moves around another object due to gravity
Down
  1. 1. the term to describe the outer planets
  2. 3. the ONLY star in our solar system
  3. 5. the only planet that can sustain life
  4. 6. the force that objects exert on each other because of their mass (amount of matter)
  5. 8. the Sun, the planets, and various other objects
  6. 9. large objects which orbit the Sun
  7. 10. a dwarf planet
  8. 11. the model of our solar system with the Earth as its center
  9. 14. the closest planet to the Sun
  10. 15. a natural satellite that orbits the Earth
  11. 16. the last planet in our solar system
  12. 18. the resistance of any physical object to any change in its state of motion