Is that really possible?
Seeing into the past
We know that's possible. Pick out any star. The closest star we can see is 4 light years away. So, the light we see at the very minimum is 4 years old. We are looking at the star's past. If there was a mirror, 10 light years away that reflected light from this planet, we could see our Earths past, as it was 20 years ago.
Changing the past
If that could be done by mankind, it would have been done in the future already. Mankind makes and breaks its own rules every day.
There's evidence of particles that travel backwards into time. Isn't it possible the transmitter was actually acting as a receiver, and they botched the experiment. Mathematical formulas almost always follow the observation. So, they're saying if I aim a mu-meson flashlight at a wall, the light might appear there yesterday. Hmmm. Well, the ground is travelling in a circle at 1,000 mph, but I'm sure those lab boys realized that.
If these particles could be emitted and controlled, wouldn't we be sending ourselves information from the future already.
I'm sure, 200 years from now, our science will look like Petroglyphs or caveman drawings.
Travelling into the future
The moment we travel into the future, it becomes the past. If we froze ourselves, we would travel into a future in what would might appear to be an instant. However, if we can't go back into the past, we've simply existed normally. No laws of nature would have been violated.
I love science fiction, but everything that we've done can be pretty easily understood.
Nothing we've done is more amazing to me, than a blade of grass.