Why outside atmosphere is dark?

Answer 1

The sky is black because there is no air to scatter sunlight. But it isn't dark. The sun is shining on everything. The Earth below is bright, the Moon and your space craft are brightly lit, you could read a book by the light of the sun. You probably even need sunglasses to protect your eyes! It is simply that the background of the distant sky is not bright because there is no air there.

Answer 2

It is dark because there is no atmosphere or dust particles to scatter, reflect, and refract incident light rays. Science fiction would have you believe that starts are visible during the daylight hours in space, but...that is only true if your eyes are 'dark adapted' and you are protected from seeing the earth below or your spacecraft, both of which cause glare. Just go on a clear night to a well-lit parking lot and look for the starts...you know they are there, but due to the glare they are difficult to see. Well, the sun is much brighter than the lights and the earth (from low earth orbit) is much brighter than the concrete, so you can see why stars are difficult to see in the daytime in space (the same holds true about images from the moon..the iris on the camera lens is stopped down due to the glare from the sun, and this keeps the much fainter stars from being viewed.

Answer 3

Because it's void outside atmosphere. The more the void, the more dark.

Answer 4

There is nothing out there for light to reflect off