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1A city in north central Colorado, east of Denver; population 319,057 (est. 2008)
2An industrial city in northeastern Illinois; population 171,782 (est. 2008)
proper nounRoman Mythology
Goddess of the dawn.Greek equivalent Eos
1A natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, usually near the northern or southern magnetic pole.
- ‘Although the solar wind produces beautiful auroras, it can also cause a variety of undesirable consequences.’
- ‘Colorful sky lights called auroras may be active at high latitudes and possibly into northern U.S. states and Europe.’
- ‘A typical example of how both missions will co-operate is the study of the magnetic substorms producing the bright aurorae.’
- ‘Experts used to think it was just a matter of the air being heated by particles and electric currents in the regions around the poles, where auroras occur.’
- ‘As it is, auroras on Earth follow magnetic lines of force that converge at the north and south magnetic poles.’
- ‘And then last week another big storm that caused auroras and beautiful geo magnetic activity all over the world.’
- ‘Bound to the Earth, our only naturally occurring experience with space weather comes from what we can see with our eyes: eclipses, comets, auroras, and sunspots.’
- ‘This causes the phenomenon called the northern lights, also known as the aurora borealis.’
- ‘Birkeland's experiments failed to account for one of the most important traits of auroras: they are common around the polar regions but exceedingly rare at the poles themselves.’
- ‘The Hubble Space Telescope has spotted auroras near the poles of both Saturn and Jupiter.’
- ‘The eventual physical effects of the storm were minimal - auroras were visible in Boston and other northern U.S. cities, but no satellites or power grids had major failures.’
- ‘In the southern hemisphere, sky watchers saw the aurora australis over New Zealand, Australia, and South Africa.’
- ‘Gaps in the magnetosphere also allow for one of Earth's most beautiful, eerie phenomena: the aurora borealis, or northern lights.’
- ‘He expanded on their work by pulling in historical records of auroras, naked-eye sunspots, and eclipses.’
2literary [in singular] The dawn.daybreak, break of day, crack of dawn, sunrise, first light, daylight, first thing in the morning, early morning, cockcrowView synonyms
Late Middle English ( aurora): from Latin, dawn, goddess of the dawn Sense 1 dates from the early 18th century.
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