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Asteroid exploded ‘just like a bomb’ over France in a uncommon occasion

September 18, 2025
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Asteroid exploded ‘just like a bomb’ over France in a uncommon occasion
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An asteroid has fragmented in an surprising approach

Wikimedia/CC-BY-SA-4.0

An asteroid exploded over France two years in the past in a uncommon single explosive occasion, elevating issues about future planetary defence from sure forms of these rocky our bodies.

On 13 February 2023, a small asteroid referred to as 2023 CX1 entered Earth’s ambiance and streaked throughout the skies of Normandy. The occasion was one among solely a handful of meteors which were tracked earlier than they enter our ambiance, this one being seen about seven hours earlier than.

The occasion produced a vivid fireball and a number of meteorites that have been collected on the bottom. Solely two asteroids have been tracked and had fragments recovered from a fall on the bottom; the second was in Germany in 2024.

Analyzing footage from cameras that tracked the asteroid’s descent, Auriane Egal on the College of Western Ontario in Canada and her colleagues noticed one thing uncommon. Most asteroids regularly break aside as they enter Earth’s ambiance, however 2023 CX1 appears to have survived virtually solely intact till it reached an altitude of 28 kilometres, the place it exploded in a single catastrophic occasion with an power of about 0.029 kilotons, equal to about 29 tons of TNT, and misplaced about 98 per cent of its 650-kilogram mass in a fraction of a second.

“It was just like a bomb,” says Egal, including it was a “single blow that generated one spherical shockwave, not a number of detonations all alongside its trajectory”.

Asteroid 2023 CX1 was small, solely about 72 centimetres throughout – in regards to the dimension of a seaside ball – so it didn’t trigger any issues on the bottom. But when a bigger asteroid exploded in the same method, it may trigger extra harm than one which disintegrated extra regularly within the ambiance.

Just one asteroid has been seen exploding in such a approach earlier than: the Novo Mesto meteor over Slovenia in 2020, which misplaced about 80 per cent of its mass in a single explosion.

“This type of fragmentation is extra harmful,” says Egal. “When you’ve got a bigger asteroid, its results are going to be amplified. Possibly we have to evacuate a bigger space close to the anticipated affect location,” if the asteroid have been giant sufficient that such motion have been vital.

A new meteorite from asteroid 2023 CX1, found in February 2023, near Dieppe, in Angiens, northwestern France

A brand new meteorite from asteroid 2023 CX1, present in February 2023 close to Dieppe, in Normandy, north-western France

LOU BENOIST/AFP by way of Getty Pictures

Why this asteroid survived a lot decrease within the ambiance isn’t solely clear, nevertheless it could be associated to its origin. The asteroid was a reasonably frequent kind often called an L chondrite, comprising a couple of third of all Earth’s meteorites, and probably originated from a dad or mum asteroid within the interior asteroid belt referred to as Massalia that had skilled collisions earlier than, toughening 2023 CX1 earlier than it encountered Earth, based on Egal and her group, who studied a meteorite from the autumn.

“We’ve a number of shock veins within the meteorite which might be witnesses [to] a number of impacts,” she says. “Possibly this community of veins glued the rock collectively, and that’s why it holds higher than different typical meteorites.”

Which may imply we have to be cautious of comparable L chondrite asteroids in future, significantly bigger ones, says Thomas Burbine at Mount Holyoke School in Massachusetts. “It’s a quite common meteorite kind, so that is the largest fear,” he says. “These L chondrites may trigger extra harm than anticipated.”

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

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