Strange skies: Seven wonders of the atmosphere.
At http://www.newscientist.com/special/strange-skies
CLOUDSCAPE
Cosmic confusion in the clouds
Where do clouds come from? Cosmic rays might be involved – and there are plenty more nebulous mysteries to ponder too
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HIGH LIFE
Invisible beings that live far above
Few creatures soar as high as the invisible denizens of Earth's skies. It is even possible that life on Earth began up there in the stratosphere
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NIGHT LIGHT
Turbocharged auroras
Most of the time the northern and southern lights are barely perceptible to the naked eye. Yet sometimes they become a hundred or a thousand times brighter
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OCEAN OF AIR
Mighty air tides
Tides in our ocean of air have surprising power, reaching down to trigger landslips and up into space to jam radio links and snare satellites
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STORMS
Lightning should be impossible
Lightning is almost as puzzling to modern science as it was to our awestruck ancestors. Could supernovae be the trigger?
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NATURAL DISASTERS
Weird earthquake warning lights
Glowing, drifting orbs; blue-white sheets of light; flames licking up from the ground: for millennia, people have reported baleful lights around earthquakes
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LAST GASP
When will our air become unbreathable?
Earth's atmosphere should remain broadly hospitable for many millions of years - but eventually the planet's last gasp will come
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