Stephen Hawking explained multiverses in final paper

My students and I in my high level lesson studied how the world-famous physicist and cosmologist Stephen Hawking published an important paper before he died last week. Professor Hawking died on March 14, aged 76. Two weeks before his death, he published his final theory in a paper called "A Smooth Exit from 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 at the same time as our universe after the Big Bang. The second theory is about how our universe will eventually end, when the stars finally run out of energy