A technologically advanced civilization will likely emit heat and/or light as a product of industrialization. Civilizations which expand across the termperate surfaces of their worlds will probably employ nighttime artificial illumination, and as their energy needs increase may rely on orbital solar arrays to harvest sunlight beyond night's meridian. Conversely, civilizations which develop underground or in oceans may have no need for surface illumination, depending instead on geothermal or hydrothermal power and thus posing a greater challenge for remote sensing.
Industrialization also generates a proportional amount of waste heat, and urbanization can further raise temperatures, particularly when artificial surfaces fail to...
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A technologically advanced civilization will likely emit heat and/or light as a product of industrialization. Civilizations which expand across the termperate surfaces of their worlds will probably employ nighttime artificial illumination, and as their energy needs increase may rely on orbital solar arrays to harvest sunlight beyond night's meridian. Conversely, civilizations which develop underground or in oceans may have no need for surface illumination, depending instead on geothermal or hydrothermal power and thus posing a greater challenge for remote sensing.
Industrialization also generates a proportional amount of waste heat, and urbanization can further raise temperatures, particularly when artificial surfaces fail to efficiently dissipate sunlight or are impervious to precipitation, a climatological phenomenon known as the "urban heat island" effect. This excess thermal output is emitted as infrared radiation.
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