Going Back?

So we may one day be able to time travel forwards but what about going back?

“Here we hit the philosophical problem that always comes up when you discuss travelling back in time,” says Dr Steane. "Suppose you could go back in time and you accidentally killed your grandparents. Wouldn’t that mean you couldn’t exist either?"

So how could you go back in time and see people who’ve died - some of them hundreds of years ago?

It's very complex.