Husserl wrote "The Phenomenology of Internal Time Consciousness." One thing it demonstrates clearly is that "time" is a phenomenon of consciousness, not of of physics.
The physics in it is the consciousness of movement, and then of difference in the lengths of those phenomenons, such as a star moving across the sky versus a caterpillar walking up a tree.
Since "time" is a phenomenon of consciousness, it cannot be manipulated outside of consciousness, in the empirical world.
However, we know that the pictures taken by the Hubble Telescope are of events that happened millions or billions of year ago. So if we were able to invent a means of transportation that would get us to one of those events in a second, would that be considered time travel? Nothing would have changed in the universe except your placement in it; yet you would instantly be at an even which in your original placement had already passed a long time ago.
But transportation to a place in the universe where something happened in a different "time" when compared to the relationship of Earth to "place X" is not the same as travelling back to yesterday.
If travelling back to yesterday becomes possible, then once again it is merely moving your own physical and mental existence from one place to another. What makes yesterday on earth different from what is photographed by the Hubble? Nothing at all, except the Hubble cannot see that close up.
So if you can go in the blink of an eye to what the Hubble sees, yet you have merely moved materially through a long distance of space, then why is that different from moving materially back to yesterday?And if that becomes possible, is it possible to move materially to an unknown place when that "place" (tomorrow) has not yet happened?
We could conceivably create a transportation device that would move us materially across the universe faster than the speed of light. To return to yesterday, we would have to invent a "Hubble" that can see yesterday on Earth by the same means. It would simply be a "closeup" shot.
But how are we to see tomorrow?Such a form of travel, to what Hubble sees, is not time travel, because time is a phenomenon of consciousness, not of physics.
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