The white lines in the sky behind the planes are condensation. And these stripes appear because hot steam from an airplane’s engine meets cold air at high altitude. Such traces remain in only 18% of flights. This is due to the humidity and temperature level. If humidity is high and the weather is cold, the trail may remain in the sky for a long time.
Scientists are also still debating whether plane wakes harm the ecosystem. On the one hand, these strips protect us from too much ultraviolet radiation. On the other hand, they can retain heat, so the planet cannot cool down normally after sunset. This could cause the Earth’s overall temperature to increase.
Source: Ferra
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