If we reflected lasers back to earth from mars could we receive information before the information is sent? If the information travelled at the speed of light to mars and back to earth would it effectively be time travel for information?

3 minutes ago, GregJones said:

If we reflected lasers back to earth from mars could we receive information before the information is sent? If the information travelled at the speed of light to mars and back to earth would it effectively be time travel for information?

That would be a causality violation c is the speed limit of information exchange as well. 

What is it in your scenario is it that makes you believe information might be 'time traveling'? Is it because you use lasers? Or because of the speed of light? Because it is 'round trip' travel? Because there is something about Mars that is special?

18 minutes ago, GregJones said:

If we reflected lasers back to earth from mars could we receive information before the information is sent?

No

Thanks for the great replies I actually just asked the same question on LBC radio and the presenter read it out and amazingly someone replied via the radio station having calculated how long it would take  the laser to return to earth. I actually thought that if we sent binary light frequencies to a reflector deep in space via laser that the information could be received before the information was sent.

Radio works at the speed of light.

Lasers are also already used for some communication.

No time travel involved.

Edit: my comment above was posted before the message above was seen.

What do you mean by "binary light frequency"?

And, it's still not clear why you think/thought information would be received before it is sent.

Edited May 4, 20241 yr by pzkpfw

9 hours ago, GregJones said:

I actually thought that if we sent binary light frequencies to a reflector deep in space via laser that the information could be received before the information was sent.

Why did you think that?

On 5/4/2024 at 12:30 AM, pzkpfw said:

What do you mean by "binary light frequency"?

For instance, yellow-orange laser light has a frequency of about 5x10**14 Hz. The binary light frequency is equivalently 1x10**110001 Hz.

How this makes a difference is of course a mystery, but adding mirrors to the situation is just going to add to the delays since the path is less straight.

On 5/4/2024 at 12:30 AM, GregJones said:

amazingly someone replied via the radio station having calculated how long it would take

Yea, about 6 to 45 minutes depending on how far away Mars is at the time. 6-45 minutes later is not 'before it was sent'. Zero justification for the suggestion otherwise has been given.

Edited May 5, 20241 yr by Halc

Quote

Receive information before it is sent

 Do you receive an SMS response before sending a message with a question?

Do you receive an email response before sending a question?

If so, start playing the lottery.. or go to the casino..

 

 

Edited May 5, 20241 yr by Sensei