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It was very well explained, but it ended before discussing its limitations - the main ones seem to be:
1) It could fit any reality - literally 10^500 realities could be described by String theory - its just too broad and adaptive
2) It isn't predicitive - it doesn't (yet) postulate things that may or may not happen
3) It deals with scales so far below the sub-atomic (10 ^ -20 metres) - we are right at Planck levels here (10 ^ -45) there are unreachable by any man made or naturally occuring event.
So if theoretical physicists have to choose from M-theory, SuSy etc - eventually you want a model that:
1. Dervives the 20+ constants that describe our reality - to high precision - and show why they take on those exact values
2. Unites General and Special Relativity with Quantum Mechanics (the world above the size of an atom with the world far smaller) - it would be brilliant if it describes what happens when two sub atomic particles get really really close (interactions between the four forces and spacetime itself).
3. Fits observable data, including expansion, big bang, inflation, dark energy, dark matter and dark flow.
4. Describes ultra high energy desnisty physics and how space time and the four forces react when energy levels approach that of the big bang or a black hole implosion within the event horizon (i.e. energies well above 10 ^ 45 Joules per cubic metre)
I love watching these series but I'd love for them to compare and contrast how they each progress towards final undderstanding based on a set of criteria they have to cover - like those above.
Myself - I tend towards M-Theory + MOND + scale relativity (saying the universe - spacetime is approximately 2.61 dimensional - i.e. fractal in large observable dimensions - at very, very small and very, very large scales).
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