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.
In object-oriented languages, a class is a data type, and objects are instances of that data type. In other words, classes are prototypes from which objects are created. For example, we may design a class Human, which is a collection of all humans in the world. Humans have state, such as height, weight, and hair color.