Stephen Hawking has revealed from beyond the grave his final scientific theory - that the universe is a hologram. The cosmologist, who died on March 14, has challenged previous theories of cosmic "inflation" and the "multiverse" in a new paper published in the Journal Of High Energy Physics. Scientists generally believe that for a tiny fraction of a second after the Big Bang, the universe expanded incredibly rapidly before settling into its present state, filled with stars and galaxies - the inflation theory.
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