I recently herd argument for the universe being finite as opposed to infinite, one of the points of contention for the finite was that;
If the universe was infinite then our night sky would be filled with Light, a light
akin to daylight since the innumerable lights from stars would blot out and
darkness.
In considering this argument the question which immedieatly jumped out is what is Darkness, While its true that a look into the night sky reveals darkness peppered in with the light of stars, this is not true darkness.
Our eyes can only preceive a form of darkness with even a iota sized influx of light. True darkness would have no influx of light period, and thereby be beyond the sightings of our eyes or our instruments.
If one layered his eyes with material that blocks all light, he will see nothing. his mind may attempt to lighten the flashing imagery that comes as a result of this act but in truth those fleeting images are not whats there.
Seeing nothing is not the same as seeing true darkness.
True Darkness is un perceviable to our sight which relies on light, even in a dark room our eyes may adjust to the darkness but only according to the influx of some light no matter how miniscule.
So to assume that a point of arguement for a finite universe is a lack of a completly lighted nighttime sky, is baseless since the eye cannot see true and absolute Darkness.