The sky on the moon is black, because there is no atmosphere (no sky). To better understand this, you need to figure out what color is and how we see it.
We see those light waves that are reflected from the object, these waves are transformed by our eyes and a signal is sent to the human brain that it is an object of this color.
How can you see anything?
The color we perceive of something depends not only on which light waves the object reflects, but also which fall on it. For example, if we see in the daylight (sunlight) that the subject is red, this does not mean at all that if the daylight is purple, we will see the same color. In such a situation, the color of the object perceived by us will change. Therefore, in order for a person to perceive any color, it is necessary that two conditions are met:
- Light waves should be reflected from the object, that is, the presence of the subject of vision (if the object completely absorbs all light waves, then it will be perceived as black).
- The presence of light waves visible and perceived by the human eye.
Why can't we see the sky on the moon?
In the case of the Moon, the first condition is missing there, that is, it has no atmosphere. Light waves reflected by the moon are not reflected repeatedly by its atmosphere (which we repeat - no). It is the atmosphere that gives the sky a certain color. The rays of light, reflected from a planet or satellite, are repeatedly reflected by the atmosphere, and we see a certain color.
Moreover, the color of the sky depends on the nature of the chemical elements in it. The sky of the earth is blue, because it is the blue color (light waves that are perceived by our eyes as blue) is reflected from the earth's atmosphere (when sunlight hits them). If the Sun shone in a different color, then the sky above the Earth would be different!
