im trying to understand the theory of this. is a CTC supposed to actually bring an object back to the original time? or is it supposed to make it appear that way to an outside observer? im reading up on it from wikipedia: http://en.wikipedia.org/wiki/Closed_timelike_curve but in the beginning they talk about it being a possible way of timetravel. then they say it "appears" to travel through time. but then once again, the next paragraph talks about multiple light cones curving all the way around and back to the original position and time: the last paragraph appears to claim that an object can physically go back in time right? so then what exactly is the other paragraph talking about saying "the object appears to travel through time as seen externally"? somehow 1 light cone only makes it appear like time-travel but a loop of light cones makes it physically possible?