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.
What is a class? Classes are blueprints describing attributes and behavior that you use to create objects while programming. In Object-Oriented languages, you'll work with a lot of classes already written, such as the Java Class Library. This availability enables you to create objects without also having to create the same classes repeatedly for each program.