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Sun’s Dark Companion ‘Nemesis’ Not So Likely

July 12th, 2010 07:38 admin Leave a comment Go to comments

TravisTR passes along a story about the death of Nemesis. “The data that once suggested the Sun is orbited by a distant dark companion now raises even more questions… The periodicity [of mass extinctions] is a matter of some controversy among paleobiologists but there is a growing consensus that something of enormous destructive power happens every 26 or 27 million years. The question is what? … another idea first put forward in the 1980s is that the Sun has a distant dark companion called Nemesis that sweeps through the Oort cloud every 27 million years or so, sending a deadly shower of comets our way. … [Researchers] have brought together a massive set of extinction data from the last 500 million years, a period that is twice as long as anybody else has studied. And their analysis shows an excess of extinctions every 27 million years, with a confidence level of 99%. That’s a clear, sharp signal over a huge length of time. At first glance, you’d think it clearly backs the idea that a distant dark object orbits the Sun every 27 million years. But ironically, the accuracy and regularity of these events is actually evidence against Nemesis’ existence.”

Source: Sun’s Dark Companion ‘Nemesis’ Not So Likely

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