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| a bright, sunny, cloudless to half-cloudy sky, with no prospect of rain, snow, or hail; not stormy |
| fog caused by the movement of warm, moist air over a cold surface |
| Main Entry: | aurora borealis |
| Part of Speech: | adj |
| Definition: | See borealis |
A display of colored lights in the sky, also called northern lights, caused by the interaction of particles from the sun with the upper atmosphere near the North Pole. A similar display, called the aurora australis, occurs in the atmosphere above the South Pole.