Einstein realized that the contradiction could be resolved if it was the speed of light that remained constant, regardless of reference frame, while both time and space were relative to the observer.
Einstein şi-a dat seama că contradicţia se putea rezolva dacă viteza luminii rămânea constantă, indiferent de sistemul de referinţă, în timp ce atât spaţiul cât şi timpul depindeau de observator.