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Blue Sky: Waves & Light Science Activity
Strange blue lights appear in skies across the world as sightings
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NASA confirms 'strange blue lights' over Arctic were rockets, not
Strange Blue Lights' Seen Over Arctic Circle Were Not Aliens, Says
Strange blue lights appear in skies across the world as sightings
Residents in west Wales report seeing 'mysterious blue light' in
What causes the Northern Lights? Aurora borealis explained
People report line of lights in the night sky