A string of glowing orbs that momentarily floated over the Valley on March 13, 1997, may have been visible for a short period of time, but it launched a mystery that, in some minds, remains today.

On a clear night with a light breeze, the Phoenix Lights appeared as if from nowhere, traveling slowly across the sky in a flattened V shape. The distance between the lights seemed equal and precise, ruling out a natural phenomenon.

Had such an event occurred today, reports likely would have spread quickly through Twitter and Facebook, with links to videos on YouTube. But in 1997, the eyewitness reports and handful of videos worked their way slowly into the national consciousness, culminating with a story three months later in USA Today. People across the country seriously considered it was a visit from extraterrestrial aliens.

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