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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
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ScienceShot: Solar Blast Suspected in Tree Ring Mystery
14 March 2013 1:45 pm
A mysterious burst of charged particles from space hit Earth at some point from 774 to 775 C.E. Scientists know this thanks to a spike in radioactive carbon found in ancient tree rings. What they didn't know was the source of the burst. Now, a team of physicists argues that our own sun was the culprit. The sun normally emits bursts of charged particles called coronal mass ejections (lower left of image), but they either never strike the Earth or are too weak to do much damage. Theoretically, however, the sun could release a burst strong enough to explain the tree rings, the researchers will report in an upcoming issue of Geophysical Research Letters. They estimate that such a blast would have been about 70 times as powerful as that which knocked out power for millions in Quebec in 1989. It could also have been about 20 times as powerful as the blast behind the solar storm of 1859, which disrupted telegraph systems in North America and Europe. Our sun is probably capable of such a huge blast, given that many distant sunlike stars have been spotted releasing flares that big, if not bigger, the scientists say, though the blast would still have been too small to cause massive extinctions.
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