The Fission Theory: This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system.
This provides modular approach to programming. Classes. A class is a concept used in object oriented programming languages such as C++, PHP, and JAVA etc. Apart from holding data, a class is also used to hold functions. An object is an instant of a class. In case of variables, the type is the class whereas the variable is the object.
Class methods are methods that are called on a class rather than an instance. They are typically used as part of an object meta-model. I.e, for each class defined an instance of the class object in the meta-model is created. Meta-model protocols allow classes to be created and deleted.