I always forget about option 1. But even that they would have solved after a couple fuck ups so its not really an option.
Its quite hard to solve though. You need to pinpoint a survivable location on a tiny speck in the universe as it rotates around a star, while that star hurtles through space at 448000mph, all while the milky way rotates at 130 mps and moves at 1.3 million miles per hour. On top of that you have to factor in the direction of movement, which may be influenced by other celestial bodies moving closer and further as time passes, and the overall heading of the milky way which may be influenced by the gravity of other galaxies and objects, in both large and small ways. The difficulty level of calculating all these factors is already immense, but we would also need to be accurate to an incredible level because even a few inches of error could result in a person traveling halfway into a wall, car, animal, pebble, or any of a myriad of undesirable objects.
And even if you chose the proper coordinates (don't be off by a millisecond!), you need your velocity to match that of where you appear or you'll be a pancake very quickly.
Yeah thats all true. But if they can solve time travel they can send back a vehicle to deal with it or something. Its definitely more surmountable than the base challenge of traveling time.
The idea is travelling back into some point in space near the Earth, then piloting the ship down to the earth's surface.
also, super-positioning would likely be avoided in some way..
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