A spiral UFO in the night sky flew over Europe and the British Isles. Was it a vehicle from outer space, or something closer ...

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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 ...

The way the light behaves resembles spiral shapes common in nature. The researchers borrowed from classical mechanics to nickname their never-before-demonstrated light vortex an "optical rotatum ...

The giant spiral didn’t look like it belonged there ... It may have become a giant elliptical galaxy, an egg-shaped collection of trillions of stars. When multiple large galactic mergers ...