A large body of scientific evidence now exists that supports the hypothesis that a major impact occurred in the Caribbean region at the boundary of the Cretaceous and Tertiary periods in Earth's geologic history. Such an impact is suspected to be responsible for the mass extinction of many species, including the large dinosaurs, that marked the end of the Cretaceous period
There is no so-called "death star" lurking at the outer reaches of the solar system, flinging dangerous comets at Earth on a periodic basis, a new study finds.
Some scientists have invoked the existence of such a star, also known as Nemesis, to explain a perceived periodicity in mass extinctions on Earth. As Nemesis cruises through space, the theory goes, it regularly disturbs comets in the faraway Oort Cloud, sending large numbers of the icy wanderers on a collision course with Earth.
The problem with that idea, according to the new study, is that Earth shows no evidence that giant impacts have occurred with any regularity. The supposed pattern appears to be a statistical artifact. [Video: End of Days in 2012? NASA Scientist Says No]
Read More: http://www.livescience.com/15446-nemesis-star-nibiru-existence-comet-impact.html
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