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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Meteorite fall | 4/5 | https://en.wikipedia.org/wiki/Meteorite_fall | reference | science, encyclopedia | 2026-05-05T07:53:37.329679+00:00 | kb-cron |
=== Meteorite of Aegospotami === The meteorite of Aegospotami might be the earliest case of a meteorite fall, where in surviving literature an observed fall is directly linked to a recovered mass. Writing about this meteorite, the ancient Greek natural philosopher Diogenes of Apollonia - living in the 5th century BCE - is also credited as the first author to argue meteorites have an extraterrestrial origin. According to writings recorded by doxographer Aetius he established:"In addition to the visible stars, invisible stones also wander through the heavens, having no name. They frequently fall on Earth and their fire gets extinguished, like the stony star which fell in flames at Aegospotami."Ancient writers including Aristotle, Pliny the Elder and Plutarch reported that a large stone fell at Aegospotami on the Gallipoli Peninsula in the second year of the 78th Olympiad – corresponding to the year 466 BCE. The meteorite was described as brown in colour and the size of a wagon load and according to Plutarch was displayed and worshipped by the inhabitants of the Gallipoli Peninsula for several hundred years, until at least the first century AD. The object itself did not survive for modern study but the event - although unconfirmed - has been treated as plausible report of a meteorite fall. The name of Diogenes of Apollonia lives on in the meteorite world, since Gustav Tschermak in 1885 proposed the name Diogenite for an abundant type of Achondrite "after Diogenes of Apollonia, who was the first to express clear ideas about the cosmic origin and the sidereal nature of meteorites." The fact that Diogenes' hypothesis about the extraterrestrial origin of meteorites was given minimal further attention and it took more than two millennia for his solution to gain scientific acceptance is also due to Aristotle. Aristotle about a century after Diogenes of Apollonia proposed a different account, treating the phenomenon as atmospheric; in his Meteorologica he discusses the Aegospotami stone in connection with a bright comet and suggests winds related to the comet carried the stone and dropped it later. In 2010 a computer model showed, that the comet described by Aristotle coincides with the retrodicted appearance of Halley's Comet in the summer of 466 BCE. Aristotle's work - in which he also proposed that interplanetary space was devoid of solid matter - exerted a strong influence well beyond antiquity and his ideas were adopted by scholars in the Middle Ages and the early modern period. As a result, even in the 18th century most western scholars remained convinced that meteorites did not originate from outer space. Instead, they were often explained as stones thrown into the air by volcanic eruptions or lightning strikes and then falling back to the ground, or as products formed within the atmosphere through the action of lightning.
== Beginning of scientific meteorite research == Around the turn of the 18th to the 19th century, a series of insights and publications, events and investigations laid the foundation for the scientific study of stones that fall from the sky. It was between 1794 and 1804 towards the ending Age of Enlightenment, when the debate shifted from anecdote and skepticism to treating meteorites as objects of empirical study, and meteoritics began to develop into a serious scientific discipline. Within ten years, four major scientific advances paved the way for broad acceptance. By 1804, most scholars accepted that meteorites are of extraterrestrial origin.
=== Ernst Chladni's book on the origin of iron masses === In April 1794, the German natural scientist Ernst Chladni published his book "On the Origin of the Pallas Iron and Other Similar Iron Masses, and on Some Associated Natural Phenomena". With his book Chladni was the first in modern Western thought to publish the then audacious idea that meteorites are rocks from space, making the book a major turning point in the understanding of meteorites. Challenging the prevailing terrestrial explanations and the widespread skepticism of his time, he proposed a coherent hypothesis that linked reported falls of stones and irons to bright fireballs and argued that these objects originated in cosmic space rather than on earth. By reframing "stones from the sky" as a legitimate natural phenomenon worth investigating, it helped kick-start modern meteoritics and paved the way for later acceptance through systematic studies and well-documented falls. Chladni is therefore sometimes considered as the father of meteoritics. After a conversation with Georg Christoph Lichtenberg, who had witnessed a fireball in 1791, Ernst Chladni started searching the literature for eyewitness accounts of fireballs and rocks from the sky. He spent several weeks in the Göttingen State and University Library – which was considered one of the leading research libraries in Germany at the time – and studied reports of 18 observed meteorite falls from various countries and dating from antiquity to the 18th century. Chladni compiled what he considered the most reliable eyewitness reports and the striking consistency among these accounts convinced him that the witnesses were describing a real physical phenomenon. The three most prominent records of observed falls studied by Chladni were the meteorites of Eichstädt (1785), Tabor (1753) and Hraschina (1751). For information on these three falls, Chladni quoted extensively from a paper "On Some Stones Allegedly Fallen from Heaven" published in 1790 by Austrian mineralogist Andreas Stütz. He compared them to the accounts of observed falls from Ensisheim (1492), Pleskowitz (1723), Nicorps (1750), Albareto (1766), Lucé (1768) and Aire-sur-la-Lys (1769). All of these meteorites are still considered observed falls today, although not all of these meteorites are still preserved.
=== Observation of falls and systematic field investigations ===