Our Solar Sytem: Vocabulary Review

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Across
  1. 1. the time it takes the Earth to complete a rotation on its axis
  2. 5. a cloud of gas and dust in space
  3. 8. furthest known planet in our Solar System
  4. 10. the group of planets which includes Jupiter, Saturn, Uranus, and Neptune
  5. 11. an envelope of gases surrounding the Earth or another planet
  6. 12. the path in space followed by a celestial body
  7. 13. the region of space which separates the terrestrial and Jovian planets
  8. 14. the extreme upper region of an atmosphere in which the motion of the gas is controlled by the planet's magnetic field
  9. 15. used to be a planet, now a dwarf planet
  10. 16. a region of space past Neptune extending to roughly 1000 AU and the source of comets with periods less than 200 years
  11. 19. a small body in orbit around the Sun, consisting of a tiny, icy core and a tail which forms when close to the Sun
  12. 22. third rock from the Sun
  13. 23. a small, generally rocky, solid body orbiting the Sun
  14. 25. a planet known for its rings
  15. 26. a circular pit, generally with a raised rim, often formed by the impact of an asteroid
  16. 27. this in combination with the revolution of the Earth around the Sun results in the seasons
Down
  1. 2. the time it takes the Earth to complete a revolution around the Sun
  2. 3. the largest planet in our Solar System
  3. 4. the Earth's "twin" in mass and diameter, it rotates clockwise, and you wouldn't want to live there
  4. 6. the blockage of light from one space object caused by the passage of another between it and the observer
  5. 7. a natural satellite of a planet
  6. 9. Mercury, Venus, Earth, and Mars are this type of planet
  7. 14. approximately the time it takes the Moon to complete a rotation on its axis
  8. 17. a planet with an extreme tilt
  9. 18. a body in orbit around a star which has cleared its orbit and has enough gravity to achieve a rounded shape
  10. 20. the planet closest to the Sun
  11. 21. often called the "red planet"
  12. 24. the cloud beyond the Kuiper Belt from which comets with periods greater than 200 years originate