Which statement about Jupiter's rings is true?
A) They lie inside Jupiter's Roche Limit.
B) They are made, in part, of material ejected by Europa's volcanoes.
C) They are dark because their ices are dirtier than Saturn's.
D) They are larger than Saturn's, but darker.
E) They were discovered by Galileo at the same time he discovered the moons.
Question 2
One star is emitting primarily visible light and another star is emitting primarily infrared light. Which star is hotter?
A) the star emitting infrared light
B) the star emitting visible light
C) Both stars are the same temperature.
D) The temperature also depends on the radius of the star, so one can't decide based on the information provided.
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