The Kaali meteorite crater
At Kaali on the island of Saaremaa lies the place where the sky once fell to earth: the Kaali crater is the first scientifically proven meteorite crater in Europe, and one of the few in the world formed in an inhabited area — possibly before human eyes. In the main crater's bowl rings a round green lake, walled in antiquity as a sacrificial site and wrapped ever since in myths of the falling sun.
The impact
The Kaali crater field was born when an iron meteorite broke apart in the atmosphere and struck Saaremaa with nine craters: the main crater about 110 metres across and 22 metres deep, and eight smaller satellite craters. Water gathered in the main bowl — Lake Kaali, its diameter swinging between 40 and 60 metres with the water level. The impact's age is disputed to this day: newer datings suggest about 1530–1450 BC, earlier estimates have ranged from 3,500 to 7,500 years ago, and charcoal samples have also given 700 ± 200 BC. What is certain is that it happened when Saaremaa was already inhabited.
How the mystery was solved
The crater's origin was long argued over — a volcano, a salt dome, even human hands were proposed. The engineer Ivan Reinwald published the meteorite hypothesis in 1928 and proved it in 1937, when he found the first fragments of meteoritic iron in the secondary craters. Kaali thus became the first scientifically proven meteorite crater in Europe. Later research confirmed a nickel-rich iron meteorite.
A sacrificial site behind a wall
To the people of antiquity, Lake Kaali was not merely a hole in the ground. Excavations in 1976–1979 revealed a circular stone wall around the main crater, its base 2.3–2.8 metres wide. Inside the wall lay abundant bones of domestic animals — horses, dogs, sheep, pigs and cattle — above all teeth and skulls, pointing to sacrifice. The place that came from the sky was holy.
The myths: did the sun fall on Saaremaa?
The Kaali impact has fascinated students of mythology too. In his book Hõbevalge (“Silverwhite”), Lennart Meri sought echoes of the Kaali catastrophe in folklore and ancient tradition — including the Greek myth of Phaethon, son of the sun god Helios, who perished driving the chariot of the sky, and the theory that the ancients' distant “Thule” may have been Saaremaa. These connections are interpretations, not proven facts — but the thought that Bronze Age people saw a ball of fire fall from the sky and told the story from generation to generation is not at all impossible.
See also
More stories of interesting Estonia: The world's first Christmas tree, Tchaikovsky and Estonia, Tenet in Tallinn and Arvo Pärt.
See also: Bernt Notke's Danse Macabre.
See also: Explorers from Estonia, Estonian science that changed the world, Estonians in exile.
Sources: Kaali kraater (Wikipedia); The age of the Kaali meteorite craters… (Vegetation History and Archaeobotany, Springer); Kaali meteorite crater field (Visit Estonia); Kaali meteoriit ja sellega seotud pärimused (Muinasaeg).