Suppose our radio and broadcast signals are traveling thru space at the speed of light. They reach some distant star system, and the race on some planet views and listens to these signals. They record these signals. It shows we are having a nuclear war and earth is almost totally destroyed.

Now let us suppose time travelers from earths distant future come back and change our past so the war never happened.

Two questions:

Do you think that these signals would simply vanish from the race from the distant star sytem, or would they have proof that it did indeed happen and could show this to us?

Or is time only relative to distance?

I simply can't see signals reversing and coming back due to the past being changed. Remember, they did happen.

Personally I don't think it would matter, the changed event would have happened prior to the signals being beamed into space. Therefore, if the war was averted, there would be no war stories to be beamed into space.

Although... Would the fact that humans traveled back in time to prevent a war be a paradox? Wouldn't the act of preventing a war change history and negate the purpose of traveling back to prevent it? Its like, the reason you travel back in time is to change an event, but that event is the very thing that triggered the necessity to travel through time in the first place?

Its like saying... Could you travel back in time with the soul intent of killing your former self?

Not unreasonable questions. But change the scenario to say, 'Radio broadcasts at the speed of sound . . .' Because if they travelled at the speed of light, the radio broadcasts may get there before the sound went out and that would give the time travellers a false echo, ha ha. Seriously, time travellers from the future of an annihilated earth got to a planet that had recorded sounds from the past earth that said that they were in the middle of an atomic war and that they needed help, right? And these time travellers went back in time and stopped the war. Would these recordings still exist on the other planet? Hmmm, interesting.
I am thinking of a Star Trek episode where the earth had records of a UFO sighting, which was the Enterprise, and Spock and Capt. Kirk had to beam down to the Air Force Base and get the recordings and Spock used his mind-meld power and wiped the witnessing pilot memories clean.
That makes it more interesting because it is the other way around.
Would the recording on the other planet be able to be shown or heard by the people of earth even though the event didn't happen or was stopped from happening?
Wow.
Now, on the Star Trek episode, the events of the future of the pilot who witnessed the ship were brought into play to assist him in forgetting the sight of the Enterprise; the birth of a son. He was brought aboard the ship to show him what future lied ahead so that he could believe what was ahead.
Now the episode of the past has to be eliminated that did occur even though the same time-line exist.
It gets harder every time.
But I can't figure out what is making it so hard.
The people of earth are living a time-line that has been changed and on another planet, they have the old time-line recorded. Would the recordings of the old time-line vanish after the time-line is changed.
If the planets interact, then the planet that has the old recordings would be that far behind the earth that has had the events stopped . . . wait, see it is so confusing.
Will the recordings vanish? No. Will the people of the earth believe the recordings? Not if they didn't happen.
But, they did happen. What is that about time? Is it only relative to distance?
A planet light years away from earth receives a message of impending disaster of the earth.
A future time-traveller from the earth goes to that planet and gets the message and travels back in time and stops the disaster.
Ohhh, will the signals be stopped? I think a new time-line is started.
Yes, I see what you're getting at.
The past time-line of this earth was leading to a nuclear war, maybe Atlantis, and at the same time there existed time travellers who were at another planet and heard of the destruction, Jesus is one example, so they went back in time and stopped it. And we have the writings of the possible destruction, Revelation; will the echo be stopped?
The new time-lines that are started only eliminate certain functions of the past. Not all of the signals are stopped. What does the bible say about the wine skins?

Mar 2:22 And no man putteth new wine into old bottles: else the new wine doth burst the bottles, and the wine is spilled, and the bottles will be destroyed: but new wine must be put into new bottles.

Luk 5:38 But new wine must be put into new bottles; and both are preserved.
Luk 5:39 No man also having drunk old wine straightway desireth new: for he saith, The old is better.

catheren janeway "temporal paradox makes my brain hurt".

dude time is 1 way it would never be sent because time is one-way it would never happen because they would go back in time and stop it before they heard so it would never happen

I highly suggest the book "Einstein's Dreams" by Alan Lightman.

It will change your life and everything you think about time.