1. Of the planetary ring systems known to exist,

A) All are bright enough to be seen without optical aid if you are close enough
B) Only Saturn’s is really bright
C) None are bright enough that they could be seen from the tops of the clouds of the parent planet

2. The Galilean satellite that seems to be covered with cracks that have been filled with ice is

A) Callisto
B) Europa
C) Lo

3. The Galilean satellites have densities that are

A) About like that of solid rock
B) Less than that of water
C) Greater than that of any of the Jovian planets

4. The probe that dropped down into Jupiter’s atmosphere was named

A) Probe
B) Pathfinder
C) Cassini
D) Galileo

5. The Galilean satellite that shows evidence of a liquid water ocean beneath its surface is

A) Lo
B) Europa
C) Ganymede
D) Titan

6. The orbits of the Galilean satellites of Jupiter are

A) Randomly oriented, and all orbit in the same direction that Jupiter rotates
B) In Jupiter’s equatorial plane, and orbit in the opposite direction that Jupiter rotates
C) In Jupiter’s equatorial plane, and orbit in the same direction that Jupiter rotates
D) Perpendicular to Jupiter’s equatorial plane and thus going over North and South Poles

7. What physical mechanism does not allow the individual particles within Saturn’s rings to combine together by mutual gravitational attraction to form one or two moons?

A) Sunlight has heated the rocks and ice to the point where they will not stick together
B) The gravitational force from the Sun does not allow it to happen
C) Tidal forces from the planet are greater than the mutual gravity between the particles
D) They are moving too fast and stick together

8. The long cracks and streaks that crisscross the surface of Jupiter’s moon Europa were most likely caused by

A) Frozen rivers that, in warmer times, were flowing across the moon’s surface
B) Tidal flexing and cracking of the surface, with fluids gushing upward and freezing
C) Volcanic eruptions, which caused lava flows that in subsequent times froze in place.