Everything that was said to be impossible in the past, have become possible through time, experience, and knowledge. Examples: Earth is not flat, Earth is not in the center of the universe, traveling to the moon, traveling to mars and beyond, we broke the sound barrier, aircraft, we split the atom. I can keep going on and on. These few things I mentioned would have been though of ludicrous in the past and in the ancient days. Even though time travel right nowseems impossible and it pretty much is impossible right now, but whos to say that it is completeley impossible. Just look how much technology we gained in just a hundred years. Mind boggling.