I was watching a "Back To The Future" marathon on tv, and me being me I'm always dissecting movies trying to find the realism in them, even if they are fiction. Well, I noticed in the original "Back To The Future" movie when Marty McFly prevents his parents from meeting in the way he knows they actually did. Consequently, his wallet photo starts to fade. So, if Marty was present in the past, he didn't prevent them from meeting because that's a fact recorded by the photo in his wallet. Couldn't "HE" have decided to prevent them from meeting? Although, the photo seems to prove that "HE" didn't make that decision, isn't he free to change his decision once he's travelled back in time? I'm thinking a world with travel into the past would obey different laws to the ones we've discovered so far. Of course, travelling into the past isn't possible. If it was, it would be a landmark development in physics.
What about the future? Can we expect to do serious time travel in the forseeable future? After all you can buy a 10 day trip to the International Space Station for about 20 million dollars, which gives you a third of a millisecond of time travel into the future.
Seriously, time travel into the future would have to be possible with the right speed, wouldn't it? Does anyone remember in 1987 and 1988 when the two Russian cosmonauts spent a year in the Mir Space Station? Well, when they returned back to earth they had aged less than their colleagues who stayed home. I mean, it was only a few milliseconds, but it was still time travel into the Earth's future. Right? Of course they wouldn't have noticed it, but I'm sure they could have easily measured it with accurate clocks.
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