The Earth in the Evernight Era experienced a sudden temperature drop due to the disappearance of the sun. The entire atmosphere cooled and fell as snow, transforming the planet into a massive pale blue snowball. The surface became a vacuum like outer space, while relics from the Sunset Era lay buried beneath the snow.
Cause
In the Sunset Era, the sun vanished for unknown reasons, leading to a drastic drop in Earth’s surface temperature. By the beginning of the Evernight Era, Earth’s atmosphere had frozen and fell to the ground as rain and snow, blanketing the planet in a vast snowfield.
Environment
The “snow” of the snowfield can be divided into three layers. From bottom to top: the ice layer, nitrogen layer, and oxygen layer. The ice layer is light blue and fell at 0°C; the nitrogen layer is colorless and fell at -210°C; the oxygen layer is light blue and fell at -218°C.
The snow layer’s depth varies with local geography and climate. The lower layers are consolidated and hard, while the top layer is loose and soft.
Due to the absence of an atmosphere, the surface is in a vacuum state, with conditions similar to outer space. Robots need heating and insulation components to operate for extended periods of time on the surface.
Relics
Most Sunset Era relics lie buried beneath about 10 meters (33 feet) of snow, and many have suffered damage due to the immense weight of the snow. Some robots formed the Snowfield Expedition Teams to find the remains of large cities and excavate useful equipment and supplies.
Moon Light and Star Light
Despite the sun’s disappearance, the moon is still shining in the sky. Alice speculates the sun is not truly gone but obscured by something between it and Earth.
In the Evernight Era, the sky is remarkably dark due to the absence of atmosphere and artificial light. However, moonlight and starlight are bright enough for robots to generate some power using solar panels.
Meteor Impacts
Without the atmosphere’s protection, small celestial bodies that once burned up in the air can now reach the Earth’s surface, creating craters across the snowfield.
Reasoning of the Robots
Robots of the Evernight Era have lived their entire lives on the sunless Earth. The chaos at the end of the Sunset Era destroyed much data, leading to a distorted understanding of reality. A popular theory even suggests that the sun never existed in reality, it can only be found in the “Heaven.”
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