Why at night,do things become dark???

Question

...tom science

Answer 1

things become dark because there is no light to illuminate them. If you mean why are they dark colored it is due to photo-receptor cells in our eyes. Photoreceptor cells are found in the retina of the eye and are responsible for transducing, or converting, light into nerve signals that can be ultimately transmitted to the brain via the optic nerve. In vertebrates, there are two types of photoreceptor cells: rods and cones. Cones are adapted to detect colors, and function well in bright light; rods are more sensitive, but do not detect color well, being adapted for low light. The human retina contains about 125 million rod cells and 6 million cone cells. The number and ratio of rods to cones varies among animals, dependant on whether the animal is primarily diurnal or nocturnal. Certain owls have a tremendous number of rods in their retinas — the eyes of the tawny owl are approximately 100 times more sensitive at night than those of humans.

Answer 2

The earth rotate about its own axis and revolve around the sun simultaniously.The moon revolve round the earth. The orbit of the moon and the earth's rotational axis is the same.when one part of the earth faces the sun, the other part becomes dark.This is because the light from the sun fall only to the part the earth faces the sun.for example when you stand near the candle when the light goes off the part u facing the candle will be visible and the rest of the thing will apper to be dark.In the same way at night things appear to be dark.when the moon and the earth is in the same axis the moon reflects the light, we get some light to see the appearence of the thing.If not everythink appears to be dark.

Answer 3

The earth is revolving around the sun and the moon and sun are only out for a period of time. When the side of the Earth that revolves around the sun is away from it--the sun appears that it is setting in that direction and then it rises again in the morning--because of the Earth's rotation. I may be wrong--but I think the moon is usually out, but can not be seen and that it revolves around the Earth.--not sure about that one. But just do a search on Earth's rotation and you will find out all.

Answer 4

In addition to the sun facing away from your side of the earth. The sky is full of all sorts of particles. The sun is illuminating those particles. Light bounces off those particles and on to other things giving some illumination.

Answer 5

well its very simple. the shape of the Earth while being in the gravity field of the sun causes it to always have one face away from the sun and night is what the side with no sunlight is called. there is a scientific explanation for everything. just think

Answer 6

Its actually the other way around. When things become dark, it changes to night.

Answer 7

We can see things because light reflects off of them. If you see a yellow cup, that means that every colour in the spectrum is absorbed except yellow. So if there is no light, there is nothing to reflect off of objects, and hence we cannot see them. Usually when lighting is very poor, we do not see colours very well.

Answer 8

The things don't become dark. The sun just disappears...

Answer 9

Because of the lack of light reflecting off of surfaces.

Answer 10

Things don't "become dark." We just can't see them because there is no light.