Beyond the Standard Model

The Standard Model answers many of the questions about the structure and stability of matter with its six types of quarks, six types of leptons, and four force types.

However, the Standard Model is an incomplete theory because it still can't fully explain the nature of the world.

Why are there three generations of quarks and leptons?
Are quarks and leptons really fundamental, or are they in turn made up of even more fundamental particles?
Why can't the Standard Model predict a particle's mass?
According to our experiments, there should be equal amounts of matter and antimatter in the universe; but, why have we observed the Universe to be mostly made of matter?
How will gravity fit into the Standard Model?
We know that there must be a lot more matter in the Universe than we can observe. What is this invisible dark matter?

Questions such as these drive particle physicists to build and operate newer and better accelerators, so that higher-energy collisions can provide clues to their answers.