The origins of the universe and Time.
The Big Bang theory. The big Bang theory says that the universe of matter and energy began at a single point, which reached a critical mass, then exploded outward. The universe continues to expand.
The universe began with a gravitational singularity, which are more common in the universe than we think.
Stephen Hawking postulated the existence of radiation, emitting through the black hole and coming out the other side. This is now accepted science.
The universe has no space/time boundaries.
There is no god. he doesn't believe that there was a God who created the universe. He doesn't believe in any sort of afterlife; he doesn't believe in heaven or hell. He does, however, believe in a grand celestial order to things, could we but understand it. He believes that there is a grand design to all the systems of the universe, and to life itself.
Stephen Hawking is dearly beloved in the common world by sci-fi fans and outer space enthusiasts, because he is a strong proponent of the likelihood of extraterrestrial life. He postulates that the earth has already been visited by extraterrestrial life in the form of viruses. We have a failure of imagination when it comes to extraterrestial life in fiction and in movies. We just can't imagine intelligent life that isn't humanoid, it seems. Stephen Hawking thinks that should we be visited by intelligent alien life, it might be the worse for us. "Like Columbus discovering America," he says. "That didn't turn out so well for the native Americans."