The L'Aigle Meteorite Shower And The Birth of Meteoritics

Prior to the 1800s, scientists were skeptical about the existence of meteorites. Despite historical reports of meteorite sightings dating back to Roman times, the idea of rocks falling from the heavens seemed implausible to scientists of that era. The prevailing belief was that meteorites were of terrestrial origin, possibly originating from volcanic activity or, as suggested by René Descartes in the 17th century, formed by the fusion of atmospheric dust particles due to lightning. A meteor shower in 1783. Image credit: Wellcome Collection In 1794, the German physicist Ernst Chladni challenged this view by proposing in a book that meteorites are extraterrestrial in origin. Chladni suggested that these celestial bodies were fragments scattered throughout the solar system that never coalesced into planets. He argued that this explanation could account for the high velocities of the falling masses, resulting in their intense brightness upon entering Earth's atmosphere. Chladni also pointed out the correlation between reported fireballs and instances of stones falling, along with the physical similarities observed in the recovered rocks from these falls. Chladni's hypothesis faced considerable controversy during its time, as it contradicted the views held by both Isaac Newton and Aristotle regarding celestial bodies. Moreover, his assertions challenged the prevailing belief that beyond the Moon, there existed nothing but stars and planets. Despite these challenges, Chladni's book sparked debate among scientists. While some embraced his extraterrestrial origin theory for meteorites, others staunchly rejected it, favoring alternative explanations involving volcanic activities, turbulent ocean currents, or the formation through lightning striking iron ore. Ernst Chladni Several years following the publication of Chladni's work, astronomers began making groundbreaking discoveries that added weight to the idea of extraterrestrial objects in the solar system.