Why was the L'Aigle fall important?
The fall of thousands of stones near L'Aigle in Normandy on 26 April 1803 was investigated by the physicist Jean-Baptiste Biot, whose careful report finally convinced the scientific establishment that rocks really do fall from the sky.
Around 1800, the question of whether stones fall from the sky was still open. Ernst Chladni had argued in 1794 that they come from space, and Edward Howard had shown in 1802 that several reported falls shared an unusual chemistry. But many leading scientists, especially in Paris, remained doubtful. Eyewitness accounts from rural people were easily brushed aside.
Then, early on the afternoon of 26 April 1803, a brilliant fireball and a series of loud explosions were seen and heard over Normandy. Around the town of L'Aigle, roughly two to three thousand stones pattered down over an area several kilometres long. Hundreds of people saw or heard them land, including townspeople, farmers and local officials, and many picked up the still-fresh black-crusted stones.
The French government asked the young physicist Jean-Baptiste Biot to investigate on behalf of the Academy of Sciences. Biot visited the area, interviewed witnesses from different villages, collected stones and plotted where they had been found. He showed that they lay in an elongated oval, which we would now call a strewn field, and that they looked nothing like local rocks but closely matched other reported meteorites. Accounts from so many independent witnesses, backed by physical evidence carefully mapped, could not be dismissed.
Biot's report, read to the Academy that summer, is often seen as the turning point that brought meteorites into mainstream science. It is also an early model of good fieldwork: gather testimony, record locations, compare samples. The L'Aigle meteorite is an L6 ordinary chondrite, and specimens are held in many museums. Today scientists still use the same logic when they map the strewn field of a new fall, though now with cameras, radar and satellite data.