Professor Stephen Hawking explains the history of mankind's quest to explain the Universe. He shows how advances in technology have brought a greater understanding of the cosmos.

Professor Stephen Hawking looks at how radio astronomy and the discovery of quasars affected the debate about the existence of black holes.

Professor Stephen Hawking explains how scientists are trying to unite the theory of relativity and quantum mechanics to find 'an answer to everything'.

Professor Stephen Hawking looks at the mystery of how the Universe. He introduces the Big Bang theory and the scientists who opposed this idea.

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

Professor Stephen Hawking looks at the search from ancient to modern times for the 'cosmic alchemy' that created all the matter that makes up our world and the Universe.