Ever wondered why you or any other people couldn’t attend the time travel party of Stephen Hawking, at least not in this universe?

It was Wednesday, Pi day, March 14 of 2018, 139 years after the birth of Albert Einstein and one of the great minds, Cambridge physicist Stephen Hawking passed away. But there are many amazing things that Stephen Hawking did, like the cocktail party a day before pyramid schemer Bernie Madoff would get sentenced to 150 years in prison.

Well, it wasn’t any normal cocktail party; Stephen Hawking was sitting on his wheelchair at Gonville & Caius College, Cambridge, beneath a banner reading, “Welcome Time Travellers.” And when the invitations were released after the party, only the host Stephen Hawking showed up. Well, partly, it was a television show stunt, the sort of combination of serious and silly that Hawking was known for.

Later, Stephen Hawking published a paper “Chronology Protection Conjecture” in the journal Physical Review D on the same day Bill Clinton became a presidential nominee, July 15, 1992. Hawking said in the paper that laws of physics might have prevented the time travelers to come to the party, “It seems there is a chronology protection agency, which prevents the appearance of closed timelike curves and so makes the universe safe for historians,” he wrote.

With lines like “As one approaches a closed null geodesic γ in the Cauchy horizon, the propagator will acquire extra singularities from null geodesics close to γ that almost return to the original point.” Throughout the nine pages, he clears argued that time travel isn’t possible along with all the evidence, “the fact that we have not been invaded by hordes of tourists from the future.”

We still haven’t achieved the speed of light, even couldn’t get to close of it. The wormholes are yet a mystery in the physical realm as well such exotic matter with a negative energy density is still unknown which would keep one open long enough for a person to pass through. Meaning, the universe is quite safe for the historians for now and perhaps for another thousand years. We also have all the history Hawking made even though we couldn’t attend the party.

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