Solving the Centuries-old Mystery of Rare ‘Bright Nights’

On rare occasions throughout history, the darkness of night fails to materialize. Even with the moon darkened, the sky fills with a diffuse glow that seems to filter out of the very air itself. Such “bright nights” have been recorded back to the days of Pliny the Elder around 132 B.C., although explanations for the phenomenon have been lacking.

Using a special interferometer and data from the 1990s, two Canadian researchers say that they can explain why the sky seems so much brighter

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