The limit of the Universe that we'll ever be able to see After watching Neil Turok's talk at 13:00 - 13:20 he says that the Universe expands and there is a limit beyond which we will never be able to see anything. 
And that's due to the Dark Matter which (as I understood) interferes with the light.
So the question is this, but please ignore the difficulties or almost-zero chance to implement (1):
Imagine we send the boundary some apparatus which is able to send a signal with the speed of light. Now, let's say we send 2 of these (you can play with induction later). Now, one stays at the boundary and sends the signals to the Earth and the second can travel further. Then suddenly we doubled the distance to that boundary, is that correct?
(1) There is a project which gives some hope or a start to hope.
 A: Your idea would not work. Once the signal has reached a station, the station does not need to re-send the signal, because the original signal is already moving with the speed of light relative to the station. Thus the presence of the station does not increase the speed of communications.
When a distant signal reaches a station, the station would already be receding from us faster than light. When this light reaches the second station, it would happen farther away from us compared to the first station, because of the expansion of space. The particle horizon cannot be penetrated.
Please note that we can see light from galaxies receding from us faster than light: "3.3 Misconception #3: Galaxies with recession velocities exceeding the speed of light exist but we cannot see them" - Expanding Confusion.
Please also note that the existence of the particle horizon depends on the cosmological model of choice. There is no experimental evidence of the particle horizon or of the fact that not all universe is observable. These are theoretical predictions of the Lambda-CDM cosmological model that is widely accepted by physicists due to its correct predictions in other areas.
A: It is not directly because of dark energy (he said dark energy, not matter), it is because of the accelerating expansion of the universe, which is believed to be caused by dark energy. The distance between opposite sides of the universe is increasing faster than the speed of light, so the light can never reach the other side. Any space crafts sent out would not go as fast as light, so they would never reach the other side either. As a result of this, once we look far enough away into the universe, objects will be red shifted because they seem to be moving away from us (objects are not actually "moving" away, see https://en.wikipedia.org/wiki/Expansion_of_the_universe ) If we look farther still we will eventually not be able to see what is "expanding away" from us faster than light.
