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A massive extinction like the one that claimed the dinosaurs has hit the Earth like clockwork every 27 million years, a new fossil analysis confirms. But the study claims to rule out one controversial explanation: a dark stellar companion called Nemesis that sends a regular rain of deadly comets toward Earth. “The main astronomical ideas you can come up with that could cause something like this just don’t work,” said physicist Adrian Melott of the University of Kansas, a co-author of the new study.
But now, Melott and co-author Richard Bambach of the National Museum of Natural History in Washington, D.C., say that’s not actually what happens. The extinctions come almost exactly every 27 million years, they say, to a confidence interval of 99 percent. “It’s really too good, it’s too sharp and fixed,” Melott said. “It’s like a clock.” Melott and Bambach compared two huge data sets going back 500 million years, twice as far as the 1984 study looked. One dataset, the Sepkoski database, is a continuation of the original study. The other, the Paleobiology Database, was compiled between 2000 and 2008. Both sets include many fossils that have been found and cataloged since 1984. The researchers searched mathematically for patterns that were common to both datasets, and found that both showed an excess of organisms disappearing every 27 million years, too regularly to be caused by a shiftable star.
Source
Melott said that back in the 1980s other researchers had posited that a small, dark star — dubbed “Nemesis” — orbiting around the sun would occasionally interact with the Oort Cloud, a faraway collection of ice and rock that forms comets.
If the hypothesis were true, Melott said, the forces of larger objects and other stars would affect Nemesis’ regular orbit enough to jar it off its regular path. Melott said that if Nemesis were the true cause of these extinctions, the extinctions should have been more sporadic.
Original source
“It’s really too good, it’s too sharp and fixed,” Melott said. “It’s like a clock.”
“It was a slam dunk on finding exactly what you would expect to find if they [Raup and Sepkoski] were right, which surprised me,” Melott said. “We have strong confirmation of this periodicity, it’s exactly the same one that those guys found in ‘84, and we have no clue what’s causing it.”
Originally posted by mileslloyd
So when's the next extinction coming?
Originally posted by packinupngoin
reply to post by jokei
Every 27 million years eh? Sooo when is the next extinction level event due to occur? And do they know what causes this event? Is it perhaps because we pass through the black hole? Seems like these articles give 1 answer and leave you with countless others.
Fortunately for us, we’ve only had about 11 million years since the last regularly scheduled mass extinction.
“But there are extinction events outside of this one, too.”
Originally posted by packinupngoin
reply to post by jokei
Every 27 million years eh? Sooo when is the next extinction level event due to occur? And do they know what causes this event? Is it perhaps because we pass through the black hole? Seems like these articles give 1 answer and leave you with countless others.
[edit on 5-9-2010 by packinupngoin]
Originally posted by Edews
Originally posted by packinupngoin
reply to post by jokei
Every 27 million years eh? Sooo when is the next extinction level event due to occur? And do they know what causes this event? Is it perhaps because we pass through the black hole? Seems like these articles give 1 answer and leave you with countless others.
[edit on 5-9-2010 by packinupngoin]
Lol... Pass through a black hole... That's too funny.
The earth would be torn to pieces. Do yourself a favor and read a bit about how black holes work.
Originally posted by Xcalibur254
reply to post by packinupngoin
First, the speculated black hole is at the center of the galaxy, while we are in one of the arms. Secondly, one cannot pass through a black hole. Look up what a curvature singularity is and their relation to black holes.
A massive extinction like the one that claimed the dinosaurs has hit the Earth like clockwork every 27 million years, a new fossil analysis confirms.
I am soooo tired of waiting for this,
Originally posted by maya27
Earth is currently going through a mass extinction. Hadn't you noticed?
We're almost there folks.