Think "Limits" and it all makes sense. The science is limited - speed of light, etc. - the love isn't limited (as is said in the ballad and closing). The love is how he can use the black hole at the end etc.
Thats a rough cut of it. But the idea isn't to think "Science" its to think "Limits" and E=MC^2 is the equation that perplexes scientists in that Light can't be surpassed - we don't think.... Theories.
Well about to head out to a Finals Party! (I'm late lol)