The “Limb” of the Earth is the visual edge of the planet’s atmosphere against the blackness of space as seen from an orbiting satellite or the moon. It appears as a thin, glowing blue arc. This perspective allows scientists to ...
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A 22-degree halo is a ring of light that forms around the Sun or Moon when its light is refracted through hexagonal ice crystals found in high-altitude cirrus clouds. These crystals act like tiny prisms, bending the light at a ...