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.
(Admittedly it would make more sense for a class with a main method to be something one could obviously execute - a main method in a Student class doesn't make as much sense.) Objects don't really have methods - classes have methods, either static methods which are called without any particular context, and instance methods which are called on a particular object of that type (or a subclass).