Stephen Hawking is a scientist.
Cosmology . Physical cosmology is the scholarly and scientific study of the origin , large-scale structures and dynamics , and ultimate fate of the universe , as well as the scientific laws that govern these realities . The Pontifical Academy of Sciences ( Pontificia accademia delle scienze , Pontificia Academia Scientiarum ) is a scientific academy of the Vatican City , established in 1936 by Pope Pius XI , and thriving with the blessing of the Papacy ever since . Stephen Hawking . His scientific works include a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction that black holes emit radiation , often called Hawking radiation .