Light and the black matter (Dark Matter)

In summary, the space between the sun and the Earth appears dark because light only illuminates surfaces and objects, and space is the absence of matter. This is similar to turning on a flashlight in a dark room and only illuminating the walls and floors, not the air. Dark matter, which doesn't interact with electromagnetism, cannot be seen directly and only its effects on light and normal matter can be observed.
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TL;DR Summary
what happens if our whole universe which is enclosed by black matter lights up or if there's a source to emit light so the whole universe is visible...
Originally Answered: If light reaches the Earth from the sun, why is the space between the sun and the Earth dark?
Because light illuminates surfaces, objects. Space is not an object, is the lack of matter. If you turn on a flashlight in a dark room you will illuminate the floors and the walls, the light from the wall will bounce and illuminate the room a bit more, but if the air is clean, not too much dust, you are not illuminating the air.

In a room we are talking small distances, just a handful of meters, so once the light bounces from a wall the entire room seems to light up, even though what lights up...
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I understand but what if something bursts in the universe the particles might scatter so we will be able to see the covered or dark matter.
 
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Are you asking why we can't see dark matter? It's because it doesn't interact with electromagnetism. Perhaps it would be better named "transparent matter" because light passes through it - so we can't see it directly. We can only see a slight curving of light paths near large amounts of datk matter due to its gravity, and its gravity's effects on normal matter.
 
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thanks
 

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