Unit 2 crossword

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Across
  1. 6. A meteor that makes it to Earth's surface
  2. 8. many small moon -like bodies that eventually collided to form the inner planets
  3. 10. orbited Saturn for 13 years; needed three gravity assists via Venus to get there
  4. 13. Mercury, Venus, Earth, and Mars
  5. 14. new star (20 million years old) with dusty accreting material around it & a newly discovered planet
  6. 16. Jupiter, Saturn, Uranus, and Neptune
  7. 18. Pluto/Kuiper Belt flyby (2015) with a large gravity boost via Jupiter
  8. 20. "Minor Planet"
Down
  1. 1. nuclear -powered “super rover” landed in August, 2012
  2. 2. flew by three times & mapped about 50% of Mercury’s surface
  3. 3. meteoroids burning up in Earth’s atmosphere
  4. 4. Groups of asteroids between Mars & Jupiter
  5. 5. the amount of the “compactness” of matter
  6. 7. giant cloud of gas & dust
  7. 9. using a planet’s gravity field to speed up or change the trajectory
  8. 11. was designed to find earth-like worlds
  9. 12. provided detailed surface radar mapping
  10. 15. an immense spherical cloud surrounding the planetary system
  11. 17. relatively small “dirty snowballs” that orbit the Sun in highly elongated orbits
  12. 19. natural satellite orbiting a larger body