In this video Christine Shupla what it is about an object that qualifies it as a moon.

Moons - for iPod/iPhone

Moons and planets

Can a Moon be as small as a toaster? How do we name moons? The planets in our solar system have often attracted our attention and captured our imagination of but in fact many scientists believe it is the bodies that revolve round the planets, the Moons which are a source of endless fascination. Moons can vary wildly as the chemical composition of each moon can often be completely different to the next and from the moment Galileo saw the 4 largest moons of Jupiter, many more have been identified but running parallel with these discoveries are any number of false assumptions about our Moon and moons in general. This collection not only gives an introduction to our most unique moons and some of their most interesting properties but also shatters many of the myths about that exist.

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Moons - for iPod/iPhone