The light from the Sun can only light up half of the Earth at a time, because it is a sphere. When one part of the Earth is facing away from the Sun, there is nothing besides the Moon and the planets to reflect sunlight back at the night side. Just after sunset and just before dawn, some of the sunlight scatters through the upper atmosphere to provide some illumination.
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When the sun sets, it moves below the horizon, causing the Earth to be in the shadow of the other side. This lack of direct sunlight reaching us results in darkness. This process is called sunset.
Light from the sun is reflected by the moon, creating 'moonlight'
The sun doesn't turn off at night. Night occurs on Earth when the part of the planet you are on rotates away from the sun, creating darkness. The sun is still shining and active, just not visible from your location on the dark side of Earth.
The time the sun goes down varies depending on your location and the time of year. Generally, the sun sets in the evening after it passes below the horizon line. You can check a local weather service or use a sun tracking app for the specific time in your area.
The moon has no atmosphere to trap heat, so during the day it absorbs a lot of sunlight and gets very hot. At night, without an atmosphere to retain heat, the moon quickly cools down and the temperature drops significantly.
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