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Haloul apare atunci când lumina solară se refractează printr-un strat de nori cirrus aflaţi la peste 6.000 de metri deasupra pământului.
Independent notează că norii conţin milioane de cristale de gheaţă deoarece picăturile de apă au încgheţat în aer.
Astfel lumina solară se reflectă în aceste cristale, iar refracţia lor duce la crearea iluziei că soarele este înconjurat de o aură luminoasă.
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