Hello, This might be an old question by now, though I have never seen any mention of it yet. I was considering all the fictional time machines and even theoretical the laser time tunnel idea. When it occurred to me that all have a certain flaw, in that they are all based on a stationary destination. For example if I was going to send a particle down Ronald Mallett’s laser tunnel or use a Delorean like machine. Rather than appear in the past or future in the same location as they originally were, they would most likely end up in empty space. Why? Because of course the planet is moving along with everything else in the universe. Go back a half a year and not only is the planet on the other side of its orbit, but the whole solar system and the indeed the galaxy it’s in has moved millions of miles for when you left, even light years if you traveled far enough in time. To be able to send a particle down a time tunnel you would have to keep all the other time frame tunnels stationary in space. Or if you were in a Delorean, go rather faster than 88mph. Just my thoughts on the matter. Cheers.