The shapes can seem to appear out of nowhere: an undulating S-like spiral streaking across the European skies or a glowing orb trailing above the North American coast. Such strange light shows ...

A large, bright blue spiral spotted over Europe on Monday night sparked chatter on social media about what might have caused the mysterious vortex. Videos posted on X showed a blue orb in the ...

A large, bright blue spiral spotted over Europe on Monday night sparked chatter on social media about what might have caused the mysterious vortex. Videos posted on X showed a blue orb in the ...