why is it in the universe is always dark and there is no light but the sun and galaxy is there?

Answer 1

The only reason the sky is not black during the day on Earth is because of our atmosphere. The refraction caused by the Sun's light through the air causes the sky to be blue. At night, the sky is black because the Sun's rays are being blocked by the Earth itself.

In space, there is no atmosphere, therefore nothing for the light to refract in. There is actually more radiant light in space, but without some sort of medium to direct it back to our eyes it appears black.

Answer 2

The nature of light is a substance that is invisible.It cannot be shadowed.
Therfore it permeates the Universe as micromass flux radiation moving in sequence at different frequencies.For this reason Light flux from the Sun passing over the earth at night are not visible ,except if another mass reflects it ,just like the moon.
We dont see light move in space and that is why the Universe appears as dark.
The fact that there is darkness at night does not mean that there is no light permeating thru out the whole Universe.
the amount of light permeating the Universe can be measured as a temperature energy.

Light difuses radially ,therefore relative to the source it has different velocities.
Velocity is measured in terms of a vector which has a magnetude and a direction.So the Velcity of light is dependent and is relative on the radial angle that the point source is emiting it.
The Intensity of the light flux is dependent on how much mass is present in a Star to form Nuclear fusion for micromass light radiation.

Answer 3

The universe is not always dark. It's usually actually full of light (except for right behind the dark sides of planets and moons), but you can't see the light, because there's nothing for it to reflect off of. Space is a vaccuum, so there is nothing there. Well, close to nothing. There is approximately an average of 1 atom per cubic meter in space. But it's mostly just emptiness, and light reflects off of somethings, not nothings. When you see light coming in from a window, the only reason you see it is because it's reflecting off dust in the air. I hope this helps. :)

Answer 4

The sun is a small star in the galaxy, all stars give off light, the empty space is dark.

Answer 5

Simply put:
The universe is filled with light, but you only see what comes directly toward you.
In the daytime sky, you see light scattered by the air and water vapor because the sun sends so much light our way.
In the night sky, you see the stars because they are so far away that very little of their light reaches us. Not enough to see the scatter and obscure the emptyness that is out there.

Answer 6

Most of space is essentially a vacuum - there's nothing for light to reflect off of or be absorbed by, and that's the only time you see it.

Answer 7

there is nothing there to reflect light.