What is Callisto made of?

Despite being 628,300,000 km from Earth, Callisto appears much brighter in the sky than our Moon when viewed through a telescope – despite our Moon being only 384,400 km. This is because the surface of Callisto is made up of a very thick layer of ice which reflects the Sun much more than the surface of our Moon. read more

Callisto / k ə ˈ l ɪ s t oʊ / (Jupiter IV) is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturn's largest moon Titan, and the largest object in the Solar System not to be properly differentiated. Callisto was discovered in 1610 by Galileo Galilei. read more

Callisto Facts. Callisto is the eighth moon of Jupiter and the second largest of the planet's known satellites. It is the third largest moon in the solar system and is similar in size to the planet Mercury. read more

The exact composition of the moon Callisto isn’t known but it is hypothesised to be made out of silicon and iron oxides and carbonates as well as chondrites and water ice. The composition of callisto can be determine by its albedo (how much light it reflects) and spectral analysis of said light. read more