Rare night-shining clouds that glow across the edge of space tend to appear near Earth's poles. But since the turn of the century, these silvery clouds have become more frequent sights over lower latitudes, new research finds.
Rare night-shining clouds that glow across the edge of space tend to appear near Earth's poles. But since the turn of the century, these silvery clouds have become more frequent sights over lower latitudes, new research finds.
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