I want to know the answer to the following question:
Edwin Hubble's discovery about galaxies allowed for which theory by Georges Lemaitre?
All the background I'm provided with is that "The observation by Edwin Hubble in 1929 that the speed at which galaxies recede positively correlates with their distance, led to the understanding that the universe is expanding, and the formulation of the Big Bang theory by Georges Lemaître.". Is that enough to answer the question?