String Theory or any other 'grand-unified theory' (M-Theory..etc) will never be proven...The math works out all right, (as difficult as it might be...) however, no experiment can be performed in the real world that would explicitly tell us that these strings exist. At this point, scientists are only beginning to construct experiments that might be able to disprove string theory using particle accelerators and such. That being said, if these experiments don't disprove string theory (or parts of it), then youre back to where you started.   The problem with tiny things is the uncertainty principle, meaning that theres inherent error no matter how sophisticated your observing apparatus is..You can only know the precise position of a particle or its precise momentum. Since strings are smaller than any particle that might exist, observing them would be very very difficult or even impossible. As it was said earlier.. its more about the math behind it than anything..   So far, three of the four fundamental forces have their mediating particles. The graviton is the only hypothetical one and string theory would go about proving its existance.    Quantum particles (photons, electrons etc..) exibit particle duality. This means they behave as a particle and a wave simultaniously. Certain experiments only work if you treat them as waves, others only as particles and even some experiments give results either way..   Gamma rays are extremely high in energy, whatever material youre observing will most likely emit photo-electons (as a result of the photoelectic effect) and the incident ray will probably end up going through the material. Im not sure how they might be used to observe quantum particles though..   Anyway.. thats enough for now..    If the Sun suddenly dissapeared, would the Earth and the rest of the planets deviate from their orbit at this instant?