Search results
Results from the WOW.Com Content Network
The Younger Dryas impact hypothesis (YDIH) proposes that the onset of the Younger Dryas (YD) cool period (stadial) at the end of the Last Glacial Period, around 12,900 years ago was the result of some kind of extraterrestrial event with specific details varying between publications. [1]: Sec 1 The hypothesis is controversial and not widely ...
The Younger Dryas (YD) was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years Before Present (BP). [2] It is primarily known for the sudden or "abrupt" cooling in the Northern Hemisphere, when the North Atlantic Ocean cooled and annual air temperatures decreased by ~3 °C (5.4 °F) over North America, 2–6 °C (3.6–10.8 °F) in Europe and up to 10 °C (18 °F ...
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 finds that the dark silicate glass strewn across a vast swath of the Atacama Desert was created by an exploding comet around 12,000 years ago.
The comet was discovered by Gottfried Kirch, a German astronomer, on 14 November 1680 (New Style), in Coburg, and it became one of the brightest comets of the seventeenth century – reputedly visible even in daytime – and was noted for its spectacularly long tail. [4] Passing 0.42 au from Earth on 30 November 1680, [5] it sped around an ...
It last passed Earth 80,000 years ago. The comet C/2023 A3 Tsuchinshan–ATLAS is seen near the western horizon from Staten Island near the Delta town of Walnut Grove on Oct. 13, 2024.
The following list is of comets with very long orbital periods, defined as between 200 and 1000 years. These comets come from the Kuiper belt and scattered disk, beyond the orbit of Pluto, with possible origins in the Oort cloud for many. For comets with an orbital period of over 1000 years (semi-major axis greater than ~100 AU), see the List ...
12P/Pons–Brooks is a periodic comet with an orbital period of 71 years. [9] Comets with an orbital period of 20–200 years are referred to as Halley-type comets.It is one of the brightest known periodic comets, reaching an absolute visual magnitude of about 5 in its approach to perihelion. [2]