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.
When you actually use that class to make a THING, this is what you make. A method is a bit of code that can be called when needed (often as part of an class, but not always) Here's an example: I write a class called Ball. In my main code, I then write a=Ball.new, b=Ball.new, c=Ball.new.
In Java, we call these method. Method names are identifiers, so they follow the rules for identifiers. They also follow the same style rules as variable names. Method names tell an object what to do. A class designer decides what base operations an object should respond to, and gives each operation a name. More complex operations are sometimes done by doing several base operations in sequence.