Some narrow rings of Saturn are seen in space probe photos to be caused by
a. gravitational interactions between ring particles.
b. a spiral density wave which confines them.
c. the magnetic field which holds them in place.
d. small shepherd moons that orbit inside and outside the rings
Question 2The narrowness of the rings of Uranus and Neptune is believed to be caused by
a. gravitational interactions between ring particles.
b. a spiral density wave which confines them.
c. the magnetic field which holds them in place.
d. the smaller mass of Uranus and Neptune as compared to that of Saturn.
e. small shepherd moons that orbit near the rings.
Question 3The rings of Uranus were discovered ____________
a. during an occultation of a star by the rings (as well as by the planet).
b. during an eclipse of one of the moons by the rings.
c. during a voyage to Uranus by astronauts
d. as Uranus and the rings passed behind Jupiter.
e. during an encounter by the Voyager 1 space probe.
Question 4The magnetic fields of Uranus and Neptune are peculiar in that they are
a. highly inclined to their planet's axis of rotation.
b. very weak (virtually zero).
c. produced by the solar wind.
d. produced by disturbances caused by the orbits of the moons.
e. all of the above.
Question 5Which of these wins the prize as the blandest appearing planet as revealed visually by space probes?
a. Jupiter
b. Saturn
c. Uranus
d. Neptune
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