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The world-famous physicist and cosmologist Stephen Hawking published an important paper before he died last week. Professor Hawking died March 14, aged 76. Two weeks his death, he published his final theory a paper called "A Smooth Exit Eternal Inflation". He explained two very important ideas. The first was how humans might be able to detect multiverses. These are parallel universes that were created the same time as our universe the Big Bang. The second theory is how our universe will eventually end, when the stars finally run of energy. Scientists say his paper could be his most important work ever, and that he could have won a Nobel Prize it.

Stephen Hawking's new paper started explaining an older theory his called inflation. This is when our universe suddenly expanded a tiny point space into the billions stars and solar systems we have today. Hawking suggested there were an infinite number big bangs and each them created its own separate universe. He called this collection universes a multiverse. Hawking wrote that he believed scientists could find the multiverse using sensors on space ships. Carlos Frenk, a professor of cosmology, said: "These ideas offer the breathtaking prospect finding evidence the existence of other universes." Hawking is also famous for his best-selling book "A Brief History Time".

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