GregJones

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.

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?