Dkosig/Getty Images In 2014, Christopher Nolan's "Interstellar" wowed audiences around the world with its emotional and even realistic approach to science fiction. However, there was one part of the movie that left some physicists scratching their heads. A big part of the narrative relies on messages left by otherworldly forces, which audiences later learn are actually messages sent back through time by the movie's protagonist, Joseph Cooper (Matthew McConaughey). "Interstellar" has been praised for featuring the most accurate black hole in cinema, so it might seem strange for it to feature something as unbelievable as sending messages backwards through time. However, new research says it might be somewhat possible to directly manipulate gravity across time  much like Cooper, thanks to time dilation. The findings are part of a new study accepted for publication in Physical Review Letters , and the paper is already available on the preprint server arXiv .…