Astronomy, speed of light?

I can't answer anyy of your questions but do you happen to be watching the history channel???? lol

Telescopes are not limited by distances. They can look into infinite distances. But the light emanating from such a spot also takes infinite time; not conceivable.

The limitation is not the telescope but that of our Retina (in the eye) or the photographic plate (or CCD) that should be blamed. If the light is too feeble it doesn't register on the eye. Light gets diminished by travelling over a distance. If it travels double the distance, it is diminished by a fourth. If it travels over ten times the distance then it gets so weak that it is only a hundredth in brilliance. In order that the far far away object should send out enough powerful light (so that it is registered on the retina), it needs to be far more brighter. At infinite distance it needs to be infinitely dazzling bright (impossible again). Our Sun with its dazzling, blinding brilliance if moved to the same distance as 'Arcturus' (Alpha Bootes, the fourth brightest star as seen from Earth), it would be one of the very faint stars (about magnitude +5.00), that wouldn't be seen in the sky of a city.

There are plenty of places in the sky with no visible light to be seen. But there is invisible light (actually radio waves, which are just like light but of a color the eye cannot see) everywhere in the sky. It is called the Cosmic Microwave Background.

Yes, there are dark places in the sky. The main reason is cloud of dust, blocking light from stars on the other side. But even if there were no dust clouds, there would not be stars everywhere we look.

Provided you mean ALL the radiation coming in, no you can never see nothing.

There is an almost uniform 'glow' of Cosmic Microwave Background, that

covers the entire sky no matter where you look.

Assuming the aperture is constant, there ought not be any regions completely void of visible matter. This is partly because the BB happened everywhere and not in one quadrant of the universe.