Aurorae has been observed on three of the bodies listed. Where has it NOT been observed?
A) Jupiter
B) Saturn
C) Ganymede
D) Callisto

Question

Quizplus · Accepted Answer

Aurorae have been observed on Jupiter, Saturn, and Ganymede, but not on Callisto. Aurorae are caused by the interaction of the solar wind with a planet's magnetic field, and while Jupiter, Saturn, and Ganymede have significant magnetic fields that can support aurorae, Callisto's magnetic field is too weak to produce observable aurorae.

Aurorae Has Been Observed on Three of the Bodies Listed