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The Younger Dryas impact hypothesis (YDIH) proposes that the onset of the Younger Dryas (YD) cool period at the end of the Last Glacial Period, around 12,900 years ago was the result of some kind of cosmic event with specific details varying between publications. [1]: Sec 1 The hypothesis is widely rejected by relevant experts.
In Ragnarok, Donnelly argues that an enormous comet hit the earth 12,000 years ago, resulting in widespread fires, floods, poisonous gases, and unusually vicious and prolonged winters. The catastrophe destroyed a more advanced civilization, forcing its terrified population to seek shelter in caves.
New research holds warnings for the future
Carvings on a 12,000-year-old monument in Turkey appear to mark solar days and years, ... Marking a massive comet strike as the start, inhabitants used symbols to record every astronomical event ...
Asteroids with a 1 km (0.62 mi) diameter strike Earth every 500,000 years on average. [17] [18] Large collisions – with 5 km (3 mi) objects – happen approximately once every twenty million years. [19] The last known impact of an object of 10 km (6 mi) or more in diameter was at the Cretaceous–Paleogene extinction event 66 million years ago.
The Atacama Desert in northern Chile is one of the driest places on Earth, but it is not the weather that has left scientists puzzled, but the glass that is scattered across a large region of the ...
The Holocene Impact Working Group has suggested that multiple significant impact events occurred in the past 10,000 years, but astrononomical models indicate that impact events large enough to cause "hazardous tsunamis" should be expected only about once per 100,000 years, making the Working Group's claims improbable enough that they call for ...
In 1998, Nakamura and Kurahashi that estimated every 500–1000 years, a comet with a diameter greater than 1 km (0.62 miles) could impact the planet. [73] This estimate was revised after the 1994 impact of SL9. In various subsequent works, values between 50 and 350 years were suggested for an object of 0.5 and 1 km (0.31 and 0.62 miles).