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