zouden said:

But it can be red-shifted into the radio spectrum.

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Cubie said:

that just goes to show how little we really understand about light and time. I dont think that the past was changed atall. Just that the current theory of how photons travel and how we see "old" light is way off.

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Zanthius said:

So, either a photon exists simultaneously in the past and the future, or a photon in the past knows about its own future.

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Qubit said:

It cant exist in simultaneously in the past and future... thats saying it exists at the same time in different times - a nonsensical statement.

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Qubit said:

The same way nearly all scientists explain all the weird happenings of quantum physics... with the copenhagen interpretation's probabilistic nature of the wave function.

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Qubit said:

No, of course not.

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Qubit said:

I have learned of it before, its just a modified double slit experiment.  The resolution of the apparent paradox is that the photon's wave traveled on each of the star (just as it traveled though each slit).  Only upon observation does the wave function collapse to a value (ie, the copenhagen interpretation).

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Qubit said:

edit - ahhh, that last sentence you added is more right.  Buts its not a choice that it went one way or the other... its a choice that it has characteristics that we would interpret classically as it went one way or the other.  The actual wave function extends throughout the universe, and taking all possible paths that exist.  So you cant really say that it went one way or the other - it went both ways.

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