MiketheBear: The article seems to say that you can travel to the past. I think it’s impossible because of the simple fact that going back in time would mean that a person would have to exist twice. Suppose you went back to a time before you were born. Before you were born, you did not exist. And yet you do exist - there you are in your time machine, existing, even though you don’t exist.
From what I understand (not much), scientists have theories to explain what youre tlaking about, Mike. The first is the Grandfather theory, or something like that. It basically states that if one were to go back in time and find their grandfather, and murder him, that logically your mother or father wouldnt exist, and therefore you could not exist. That is impossible, however, because your grandfather could not be murdered by someone who never even existed–so it completely contradicts itself.
This is explained by the Many Worlds Theory that basically says that each time a person makes any kind of decision, time branches off, like a tree. So with every decision a new branch and a new world are created, with those branches continuing to different ends then other branches. There are infinite branches because there are infinite decisions, so, theoretically, nothing is impossible because there are infinite possibilities.
To wrap up the Grandfather thing, the Many World’s Theory solves the issue of the Grandfather theory by stating that the person you killed was not YOUR grandfather. He looked exactly like him, smelled like him, etc etc, but could not possibly be your actual grandfather, because someone cannot be murdered by someone who does not exist.
This post may make no sense whatsoever, haha.
The many worlds theory doesn’t quite say that it is not your grandfather per say, it does say that your grandfather exists on many different planes of existance, and one of them could in fact involve you coming from some future plane of existance and killing him, obviously, you would cease to exist in that plane of existance in the future, but since you did not originate in that plane everything is ok.
In fact, the many worlds theory proposes that every time a big enough decision is made by you, one which will alter your path in life, a split occurs in which you make all possible decisions and each starts fresh on it’s own path, it is not entirely clear why your consiousness follows the path chosen, but again, you never really know if you have consiousnesses that followed different paths that are self aware as you are. It seems like it would be necessary for that to happen for all the splits to life out thier existance. Needless to say, if I ever see myself, I will be pretty surprised.