Conspiracy theorists claim the REAL professor is DEAD and a 'puppet' has taken his place - and reveal the SIX clues that support the idea Professor Stephen Hawking is one of the world's most well-known scientists and has had his life story told in books, documentaries, and Oscar-winning dramas. But conspiracy theorists claim we hardly know anything about the award-winning physicist, who celebrated his 76th birthday on Monday. For there are certain corners of the internet where people are convinced that the real Professor Hawking died decades ago and that in the intervening years the political and scientific elite have installed a lookalike to act in his place. Some of those who believe he has been supplanted think Professor Hawking, Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge, died in 1985 - three years before the publication of his best-selling book A Brief History of Time. The idea might seem outlandish, but conspiracy theorists have outlined six signs that they claim clearly support their idea, ranging from the way he looks to the complexity of his theories. The Six Signs: His appearance People change as they age – there's no doubt about that – but, as the conspiracy lovers point out, not many people look younger in 2017 than they did in 1982, especially if they're suffering from a disease as disfiguring as ALS. Nor do people's ears decrease in size and as they get older; and, although gums can recede and teeth can wear down and fall out, it's rare for teeth to change in structure completely without major dental work. Hair that gets blonder and less grey with age can be explained, but why would someone vain enough to dye their hair neglect their teeth so badly? In fact, when the sceptics examine photographs of the man they consider to be an imposter, they often comment that his teeth look as if they've been made worse, with the bottom teeth longer than they were previously (and disrespectfully referred to by some members of the conspiracy community as "the twin towers") and the top teeth filed away to stubs. His condition It's not just how he looks that's the problem – there's the issue with his condition. The average life expectancy for a person suffering from ALS is said to be four years from diagnosis. Stephen was diagnosed in 1963 with a prognosis of two years. Yet it would appear that he is still alive - miraculously, some would say – some 55 years later. The wedding photographs The pictures taken on the day of his marriage to first wife Jane Wilde (whose book Travelling To Infinity: My Life With Stephen was made into the 2014 film The Theory Of Everything) look pretty normal. There's Hawking, long-faced, square-jawed with his floppy dark hair and crooked teeth holding hands with his new baby-faced wife. But it's the photos of his second wedding, when he married Elaine Mason, a woman who'd worked as his nurse, that have come under scrutiny. Photos available of that wedding show Mason wearing a different wedding outfit in each and looking decidedly older with shorter redder hair in the second photo. In the first, she appears with Stephen Hawking and in the second, she is standing alongside someone who certainly looks like Hawking but who, doubters have concluded, is more than likely a lookalike. Independent investigators think old pictures of Hawking are gradually being erased and replaced with Photoshopped or even re-shot versions. The voice-synthesizing computer His voice-synthesizing computer is another matter for conjecture. It's said to work by Hawking twitching a cheek muscle to scan and choose words on the screen and these written words are then turned into spoken words via the voice synthesizer. Those who believe that Professor Hawking is a puppet for the elite don't believe that anyone could do all this simply by twitching a cheek muscle and have observed that he's not constantly moving his face when he's 'talking'. What they think is actually happening is that the professor isn't doing anything at all and the voice we hear is the result of NASA astrophysicists typing information into a computer – information that they want the masses to hear and trust - and it being transmitted to the computer attached to Hawking's wheelchair. The robot voice that emanates from that computer has nothing to do with Hawking – it's just information that NASA want to push onto a gullible and unsuspecting public, fans of Hawking, who hang on to - what they believe to be his - every word. The complexity of his theories A lot of the theories presented by Hawking are difficult to prove. An example of this can be seen in a TV programme, hosted by Magnus Magnusson, where Hawking appeared alongside science fiction writers Arthur C. Clarke and Carl Sagan. The voice from the machine spoke. It said: 'There are two kinds of time. There is what's called real time. This is the kind of time that's measured by a clock, the time that we feel passing, the time in which we grow older… Then there is imaginary time… a well-defined mathematical concept… Imaginary time has no beginning or end. Imaginary time is closed in on itself, like the surface of the earth. The surface of the earth doesn't have any beginning or end…' So why the need for a 'puppet professor'? If what the conspiracy theorists say is true and if the real Hawking has been switched, the question would obviously be: why? The most common theory is that it was – and still is - important for those in control to push science and 'lose' God. The powers that be want people to feel that they are tiny unimportant dots in an infinite universe, on one of a trillion planets, in a sea of countless suns, the reason being that people who feel insignificant and small also feel powerless and unimportant, thus making them easier to control. They also want to get the public used to accepting theories as fact. The substitute Hawking, they claim, is used as a puppet to instill fear in the general population, promoting the idea that the human race has only 100 years left, that aliens exist and that contact with them – which may be imminent - could be catastrophic. All this scaremongering puts the public in a fearful state, again making them easier to manipulate. Sceptics have observed that the 'puppet professor' is also a great proponent of Artificial Intelligence and science, claiming that 'philosophy is dead', that there is no God and that science has the answers to everything – all of which goes against his earlier philosophical stance and theories. The Hawking of the last ten years has also pushed global warming, is anti-Trump, anti-Scottish Independence and anti-Brexit. He is suddenly very political, seemingly allowing his name to be tacked onto anything and everything in an attempt to make certain ideas or political agendas more credible; and, because the general public believe Professor Hawking is one of the most intelligent scientists of all time, this works. In recent years, he's waxed lyrical about climate change, is a supporter of The Paris Agreement and, in an article in The Guardian last year, was quoted as being in support of carbon tax. He also recorded a tribute for the Democratic candidate Al Gore and was part of an academic boycott of a conference in Israel. There are many more examples of how Hawking's name has been attached to various political agenda, which truth-seekers find highly suspicious. Some of those who believe Stephen Hawking has been supplanted think he died back in 1985 when he contracted pneumonia and was on life support. His life was purportedly saved by a tracheotomy. Prior to this, he'd been unable to communicate, but when he returned – looking noticeably different – he was miraculously able to 'talk' using an unbelievably advanced computer system. Not only was he able to communicate better than ever, he was also able to convey ideas that contradicted previous ideas and supported new, money-making agendas, allowing his name to be used to sell whatever scam, idea or product governments or big companies want to sell. The motive is there. The pictures speak louder than words. So could it be that the conspiracy theorists are right this time?