A space rock flared over the skies of Portugal and Spain in mid-May. It was a piece of comet and its flare was seen by a satellite.
A map of the track of the vaporizing space rock that lit up skies over Portugal and Spain on May 18, 2024. The track was created from position measurements of the fireball flashes as seen by ESA's MeteoSat weather satellite. Courtesy ESA.
The incoming meteor dazzled viewers across both countries as it sped across the skies at 160,000 km/hour. Of course, social media came alive with speculation about what was burning up in the atmosphere. Most people thought it was a piece of space rock from an asteroid. European Space Agency members of the Planetary Defence Office immediately began analyzing images and data to figure out the composition of the impactor. Now it seems more likely the chunk of space debris came from a comet.
It’s not known which comet supplied the chunk that broke up and vaporized that night. Earth’s orbit crosses the orbit of several different comets. As they travel through space, particularly as they get close to the Sun, comets shed pieces of themselves. That cometary debris stays in the original orbit around the Sun. Occasionally, Earth’s orbit intersects that cometary path. Its particles particles eventually end up in our atmosphere.
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