Question: Edwin Hubble's discovery about galaxies allowed for which theory by Georges Lemaitre?
Sentence: Not only did quantum mechanics show that the laws of motion did not hold on small scales, but even more disturbingly, the theory of general relativity, proposed by Einstein in 1915, showed that the fixed background of spacetime, on which both Newtonian mechanics and special relativity depended, could not exist.
Answer in sentence: no