Final answer:
Edwin Hubble provided evidence for the expanding universe, George Lemaitre is considered the father of the Big Bang Theory, and Albert Einstein's theories of relativity were essential in understanding the dynamic nature of the universe.
Step-by-step explanation:
Edwin Hubble played a major role in the formulation of the Big Bang Theory by providing observational evidence for the expanding universe. He discovered that galaxies were moving away from each other, suggesting that the universe was expanding.
George Lemaitre, a Belgian cosmologist and Catholic priest, is considered the father of the Big Bang Theory. He proposed a specific model for the Big Bang, envisioning all matter starting in a primeval atom which then fragmented into the atoms of the present universe.
Albert Einstein did not directly contribute to the formation of the Big Bang Theory, but his theories of special and general relativity were essential in understanding the dynamic nature of the universe and the need for a cosmological solution.