March 17, 2010
- These events
- Late Devonian
- Ordovician–Silurian, and so on…
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The Nemesis (book) is a hypothetical red dwarf star or brown dwarf, orbiting the Sun at a distance of about 50,000 to 100,000 AU (about 1-2 light years), somewhat beyond the Oort cloud. It’s supposed to be a “twin” of the earth. The star supposedly disturbs the Oort cloud which causes comets to be sent to the solar system and hence is the cause of mass extinction cycle whose period is about 26 mn years (list).
Asimov’s book Nemesis is about the hypothetical star.