The world-famous and cosmologist Stephen Hawking published an paper before he died last week. Professor Hawking died on March 14, aged 76. Two weeks before his , he published his theory in a paper called "A Smooth Exit from Eternal Inflation". He explained very important ideas. The first was how humans might be able to detect multiverses. These are universes that were created at the time as our universe after the Big Bang. The second is about how our universe will eventually end, when the stars run out of energy. Scientists say his paper could be his most important work ever, and that he could have won a Nobel Prize for .
Stephen Hawking's new paper started by explaining an theory of his called inflation. This is when our universe expanded from a tiny in space into the billions of stars and solar systems we have today. Hawking suggested there were an number of big bangs and each of them created its own separate universe. He called this of universes a multiverse. Hawking wrote that he believed scientists could find the multiverse by using on space ships. Carlos Frenk, a of cosmology, said: "These offer the breathtaking prospect of finding for the existence of other universes." Hawking is famous for his best-selling book "A Brief History of Time".