7. between the inner ring and the outer ring of Saturn there is a ___________________.

　　8. Compared with that of the earth, the gravity force on the surface of Uranus is _____________.

　　9. According to the International Astronomical Union, Pluto is no longer seen as a planet; instead, it should be termed as ________________.

　　10. Its eccentric orbit and its _____________ disqualified Pluto as a planet.

　　1. (Y)

　　2. (NG)

　　3. (N)

　　4. (Y)

　　5. (hydrogen)

　　6. (the gravitational forces)

　　7. (black band)

　　8. (the same)

　　9. (dwarf planet)

　　10. (size / disproportionately small size)