A dazzling aquamarine light lit up the skies over Spain and Portugal on May 18, caused by a fragment of a comet.

The blue-green hue was due to the comet's magnesium-rich composition.

The comet disintegrated 37 miles above Earth, leaving little recoverable debris.

The incident highlights the need for improved detection and tracking of celestial objects for planetary defense.

The comet was undetected before its arrival, prompting experts to analyze 'precovery' data for more information.

This event is a reminder of the hazards posed by unforeseen space objects and the importance of vigilant monitoring to protect Earth.