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| | Nemesis, Proposed Companion Star to the Sun and Mass Extinctions on Earth |
 | | Nemesis was the culmination of a chain of events that began in 1977, in Gubbio, Italy, a tiny village halfway between Rome and Florence. |
 | | As envisioned by Muller, Davis, and Hut, Nemesis is probably a red dwarf, the most common type of star in the galaxy (three-fourths of all the stars in the Milky Way are believed to be red dwarfs). |
 | | Under the Nemesis scenario, what at first glance might appear to be a single, gradual extinction, would, upon closer scrutiny, turn out to be a series of individual, abrupt, mass die-outs. |
| www.lbl.gov /Science-Articles/Archive/extinctions-nemesis.html (4559 words) |
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