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Nemesis is a hypothetical red dwarf [1] or brown dwarf, [2] originally postulated in 1984 [3] to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), [2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.
A hypothetical dark companion star, Nemesis, with an eccentric orbit of about 27 million years, triggers periodic mass extinctions by perturbing objects beyond Neptune into hitting the Earth. The K–Pg extinction which killed dinosaurs 66 million years ago is used as an anchor point in time for the cycle.
Pages in category "Extinction events" The following 51 pages are in this category, out of 51 total. ... Nemesis (hypothetical star) O. Olson's Extinction;
The largest extinction was the Kellwasser Event (Frasnian-Famennian, or F-F, 372 Ma), an extinction event at the end of the Frasnian, about midway through the Late Devonian. This extinction annihilated coral reefs and numerous tropical benthic (seabed-living) animals such as jawless fish, brachiopods, and trilobites.
Nemesis' design emphasized asymmetry in contrast to Mr. X, but also implemented multiple belts to keep the parasite restrained. Nemesis' appearance was designed by Yoshinori Matsushita, with Aoyama instructing him to create "a rough guy who attacks with weapons and has an intimidating build" in order to heighten the fear of being pursued.
The Siberian Traps was a vast area of volcanic activity in Eurasia that led to the biggest mass extinction 252 million years ago. The distant mountains are remains of basalt lava flows, and the ...
Permian–Triassic extinction event 252 Ma Large igneous province (LIP) eruptions [ 23 ] from the Siberian Traps , [ 24 ] an impact event (the Wilkes Land Crater ), [ 25 ] an Anoxic event , [ 26 ] an Ice age , [ 27 ] or other possible causes
Scientists have recently discovered a new primate species in Myanmar’s central forest. However, the Popa langur, named after nearby Mount Popa, is tragically already on the verge of extinction.