Solar System Crossword

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Across
  1. 3. The natural satellite of the earth (other planets have them too).
  2. 5. The sun is composed of hydrogen and __.
  3. 8. Sphere-shaped group of small rock and ice that are the furthest objects from the sun.
  4. 10. The third planet from the sun.
  5. 12. The closest planet to the sun
  6. 13. The farthest planet from the sun
  7. 14. Debris from comets that would be meteors if they enter earth's atmosphere.
  8. 15. These orbit the sun and are located between Mars and Jupiter.
  9. 17. When an object spins on its axis
  10. 19. Disk-shaped group of small rock and ice beyond the orbit of Neptune.
  11. 21. Force of attraction between two objects due to their masses.
Down
  1. 1. The process in which plants create oxygen and chemical energy, which is one reason why life exists on earth.
  2. 2. The earth is 78% __.
  3. 3. These burn when entering the atmosphere, causing light.
  4. 4. Jupiter, Saturn, Uranus, and Neptune are all __ planets.
  5. 6. The earth is 21% __.
  6. 7. These form large tails of gas and dust, melt when they near the sun, and originate from the Kuiper belt or Oort cloud.
  7. 9. The largest and hottest object in our solar system.
  8. 11. When an object moves around another object.
  9. 16. the curved path of a celestial object or spacecraft around a star, planet, or moon
  10. 18. Mercury, venus, earth, and mars are all __ planets.
  11. 20. The collection of planets, moons, and other objects that orbit around the sun.