Crossword: Solar System

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Across
  1. 3. The angle between the Sun and Planet with Earth as the reference point.
  2. 5. Time it takes planets to return to the same position relative to the stars.
  3. 8. When two planets meet in the sky or when a planet is aligned with the sun, have only been observed about 9 times.
  4. 9. The force that causes the nebula to contract
  5. 11. natural satellite orbiting a larger body.
  6. 15. ___________Planets Planets farther from the Sun: Past Earth's Orbit - Mars, Jupiter, Saturn, Uranus, and Neptune.
  7. 17. small pieces (<100m) of asteroids resulting from collisions.
  8. 19. Cloud of gas and dust
  9. 20. ___________Planets Mercury, Venus, Earth, and Mars.
  10. 21. ___________Motion Apparent change in the movement of the planet through the sky, appears to be moving 'backwards' in the sky.
  11. 22. ___________Planets Planets close to the Sun: Mercury and Venus.
Down
  1. 1. When planets are on opposite sides of the celestial sphere (abstract sphere, Earth is the center).
  2. 2. ___________ Planetology Comparing and contrasting properties of worlds to understand how they evolved.
  3. 4. ___________Planets Jupiter, Saturn, Uranus, and Neptune.
  4. 6. a meteor that makes it to Earth's Surface.
  5. 7. relatively small 'dirty snowballs' that orbit the Sun in highly elongated orbits.
  6. 10. also called 'minor planets', are small rocky metallic debris left over from the beginning of the solar system.
  7. 12. Configuration of objects in space, elongation is perpendicular to the direction of the Sun.
  8. 13. meteoroids burning up in Earth's atmosphere.
  9. 14. Time it takes planets to return to the same position relative to the Sun.
  10. 16. ___________ Definition Must have the three characteristics to be a planet: Orbits the Sun, Not a Satellite (moon, asteroids, etc.), Has cleared out its orbit of debris and is round.
  11. 18. ___________Planet massive enough to be a round body, but has not cleared its orbit of debris.