The three categories of Universe.
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We need three main conceptions/ categories to understand
the Universe: matter, movement and reference frame.

We know some kinds of reference frames:
Newton’s and 4D – SRT, GRT and Su(2)- QCD,
Su(3)U(1)- EW and 11D-String, . . . Etc.

We know some kinds of matter/mass :
Rest mass and Massless, Inertial and Non-inertial,
Gravity , Constant and non-constant, . . . .Etc.

We know some kinds of movement:
Constant and relative, Inertial and accelerated,
Straight and rotated.. . . . . Etc.

From these categories specialists created Standard Model.
http://en.wikipedia.org/wiki/Standard_Model
And using this model specialists hope to create
Grand Unified Theory. (GUT)
http://en.wikipedia.org/wiki/Grand_unified_theory

My opinion of the Standard Model expressed Poincare:
"Science is built up with facts, as a house is with stones.
But a collections of facts is no more science
than a heap of stones is a house."
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Best wishes.
Israel Sadovnik Socratus
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