aurora

An aurora consists of bands of light in the sky along the north and south poles. An aurora is a beautiful astronomical light show.

If you look up at night and see bright bands of light, it's not an invasion by aliens: it's a natural, electrical phenomenon called an aurora. An aurora can happen at either of the Earth's magnetic poles, north or south. An aurora is considered one of the most gorgeous natural occurrences, and you’re lucky if you see one. The two types of auroras are called aurora borealis and aurora australis — which mean northern lights and southern lights, respectively.

Definitions of aurora
  1. noun
    an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force
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    types:
    aurora australis, southern lights
    the aurora of the southern hemisphere
    aurora borealis, northern lights
    the aurora of the northern hemisphere
    type of:
    atmospheric phenomenon
    a physical phenomenon associated with the atmosphere
  2. noun
    the first light of day
    synonyms: break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup
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    Antonyms:
    sundown, sunset
    the time in the evening at which the sun begins to fall below the horizon
    type of:
    hour, time of day
    clock time
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