Because it is a shadow of the moon and the sky
A night without a moon and no clouds is called a black moon
No clouds always appear white. It is only night because the Earth is rotating and the Sun is not shining light on that part of the Earth.
During a clear night, heat from the surface of the Earth radiates out into space since there are no clouds to trap it. Clouds act as a blanket, trapping heat near the surface and preventing it from escaping, which leads to warmer temperatures on cloudy nights compared to clear nights.
"It is stormy outside, with dark clouds and heavy rain."
A clear sky refers to a sky without any visible clouds or significant obscuration, resulting in a bright blue appearance during the day and a dark, star-filled sky at night. Clear skies are often associated with good weather conditions and allow for better visibility of celestial objects such as stars and planets.
On a clear night. Clouds will prevent the heat that the earth has collected during the day because of the sun, to evaporate at night.
On any clear dark night.
Some clouds appear dark in a clear sky due to the thickness and density of the water droplets or ice crystals they contain. When sunlight passes through these dense clouds, it scatters and absorbs more light, causing them to look darker compared to the surrounding clear sky. Additionally, the base of the cloud may block sunlight, contributing to its darker appearance.
If there are no clouds in the sky, we will see the full extent of the atmosphere above us and all the celestial bodies such as the sun, moon, stars, and planets. The sky will appear clear and bright during the day and reveal a dark sky filled with stars at night.
The sky is clear when there are minimal particles and moisture in the atmosphere, allowing light from the sun or stars to pass through unobstructed. This creates a transparent view in which the sky appears blue during the day and dark at night.
Since clouds are cool moist air, and cold air is heavier than warm air, the cloud cover holds down the warmth that accumulates during the day and keeps the ambient temperature slightly higher over night.
Dark rain Clouds are clouds that are black when it rains