Question 1

True or false: Callisto is tidally locked to Jupiter, always showing the same face.

Accepted Answer

True. Like our Moon, Callisto's rotation matches its orbit, so one hemisphere permanently faces Jupiter.

Question 2

True or false: Callisto was discovered by Galileo Galilei in 1610 along with three other Jovian moons.

Accepted Answer

True. Galileo spotted Callisto, Io, Europa, and Ganymede in January 1610, revolutionizing astronomy.

Question 3

True or false: Callisto is the largest moon in the solar system, even bigger than Mercury.

Accepted Answer

False. Ganymede is the largest moon; Callisto is only slightly smaller than Mercury but less dense.

Question 4

True or false: Callisto has the oldest, most heavily cratered surface in the solar system.

Accepted Answer

True. Its ancient, icy crust is saturated with impact craters, making it the most heavily cratered known object in the solar system.

Question 5

True or false: Callisto is the outermost of Jupiter's four large Galilean moons.

Accepted Answer

True. Jupiter's four largest moons, discovered by Galileo in 1610, are Io, Europa, Ganymede, and Callisto in order of increasing distance from the planet. Callisto orbits farthest.

Question 6

True or false: Callisto has a thin carbon dioxide atmosphere that freezes out during its night.

Accepted Answer

False. Callisto’s exosphere contains CO2, but it doesn't actually freeze at night—its tenuous atmosphere is always present.

Question 7

True or false: Callisto experiences volcanic eruptions from cryovolcanoes that spew liquid nitrogen.

Accepted Answer

False. Callisto's surface shows no evidence of cryovolcanic activity. Geysers of liquid nitrogen are observed on Neptune's moon Triton, not on Callisto. This statement is false.

Question 8

True or false: Callisto generates its own magnetic field strong enough to deflect Jupiter's radiation.

Accepted Answer

False. Callisto lacks an internal dynamo; its induced magnetic field is a response to Jupiter's magnetosphere, not self-generated.

Callisto Trivia Questions