Planetary Systems

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Across
  1. 5. The totality of everything that exists
  2. 9. Only known planet on which life exists
  3. 10. Natural science that studies celestial objects
  4. 14. A celestial body orbiting a star
  5. 15. Icy bodies in space that release gas or dust
  6. 17. On or relating to the earth
  7. 18. Alpha Centauri is a _________
  8. 19. Path followed by an object revolving around another object,
Down
  1. 1. Force by which a body draws objects toward its center
  2. 2. Largest Planet in the Solar System
  3. 3. Positioned in or relating to the sky, or outer space
  4. 4. They are also called minor planets
  5. 6. Second planet from the sun
  6. 7. Object in space too small to be called an asteroid or comet.
  7. 8. The earth going around on its axis
  8. 11. Planet nearest to the sun
  9. 12. Dwarf Planet
  10. 13. Our _____ is called the Milk Way
  11. 16. Astronomical body that orbits planet Earth
  12. 18. Nearest star to earth