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Before he passed away in March, theoretical physicist Stephen Hawking had published more than 230 articles on the birth of the universe, black holes and quantum mechanics. It turns out he had one more theory left in the locker.
On Wednesday, the Journal of High Energy Physics published the British scientist's final thoughts on the Big Bang, the leading theory for how the universe began. The new report, co-authored by Belgian physicist Thomas Hertog, counters the longstanding idea that the universe will expand for eternity. Instead, the authors argue the Big Bang had a finite boundary, defined by string theory and holograms.
