[ICR Creation Online] Our Solar System is quite diverse, with its planets and satellites and other bodies having extremely different compositions and histories. It is claimed that, if our Solar System was formed from a single cloud of dust, then all planets should have the same composition. This is akin to saying that gasoline and plastic should be similar because they both come from crude oil. Even though the bodies of the Solar System came from the same source, they have had radically different histories, due to their different locations and the conditions to which they have been subjected. For example, the higher temperatures at the locations of the inner planets caused them to lose their hydrogen and helium, while the lower temperatures of the outer Solar System allow for the possibility of icy and gaseous bodies. For another example, tidal forces can cause satellites that are closer to their planets (such as Io, Europa, and Enceladus) to be geologically active, while nearby satellites (such as Callisto and Rhea) have been relatively quiet. On the other hand, many similarities also exist in the Solar System, such as the similar heavily cratered surfaces of the Moon, Mercury, Callisto, and many other bodies. The diversities and similarities in our Solar System do make Planetary Science an interesting and exciting field, but they do not present an overall problem for scientists.