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.
Instance methods of the class can also not be called from within a class method unless they are being called on an instance of that class. Instance methods. on the other hand require an instance of the class to exist before they can be called, so an instance of a class needs to be created by using the new keyword.