Word Pairs


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

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

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