One cubic light year of space

On youtube I found some interesting videos. Video material as you know is easily absorbed - and if you could touch...

Light year - the distance that light travels in one year. Inconceivably far is because a 1-second light flew 300 thousand kilometers. But if of the universe "excision" cube space in which all sides are equal to 1 Lightyear?
How much and what we find in the cube?

Specifically, be to ask how much we find emptiness, because it was the thing to be dominant in a cubic light year of space of the universe.
However, a more precise answer depends from the region of the universe whence is "Dug out" the giant cube.
If the center of the galaxy was taken, then the cube will be chock-full of stars.
And if taketh the globular cluster center?
And maybe - a nursery of stars called nebulae, where new stars are born many?
And if taketh the Milky Way galaxy?
It must be remembered that there is an uncannily large distances between galaxies, where there is virtually nothing.

What we find in 1 cubic light year of space?
How much the material is in a Light Year?

Out of curiosity, can be calculated in the Milky Way galaxy average density and consider it to be a starting point.
Our galaxy disk diameter is about 100 thousand light years away, thickness - about 1 thousand light years away.
Astronomer Phil Plait believes that the volume of the Milky Way is about 8 trillion cubic light years.
The total mass of our galaxy is 6 x 1042 kg.
All divided, it would be 8 x 1029 kilogram per cubic light year.
Eight and twenty-nine zeroes kg of material.
Is that a lot? Sounds like a lot.
But;
It is only about 40 percent of the mass of our Sun. In other words, each of the Milky Way galaxy per cubic light year of space on average, only 40 percent of the solar mass.

However, interstellar space in the desert (and what to talk about intergalactic internal) material density drops very sharply.
The cubic meter of interstellar space, just happen to find a few hundred atoms.
The intergalactic space cubic meter of atoms so that they can be counted on the fingers of one hand.
So how much of everything is a cubic light year of space of the universe?
Everything depends on the region of the universe.

However, if all the material spread evenly in the universe, the answer would be perplexing: on average, there are almost no nothing.