Time Travellers Beware

NZ relativity expert, Professor Matt Visser, attended a Cambridge University discussion on the troublesome issue of time travel, in honour of Stephen Hawking’s 60th birthday. “Most physicists view time travel as being problematic, if not downright repugnant,” he said in an Age feature, pointing to the famous paradox of a time traveller killing his infant grandmother. “Is chronology protected? Despite a decade’s work, we don’t know for certain.”