For more than four weeks last year, a previously unknown
third radiation belt circled Earth before it was annihilated -- along
with the entire outer belt -- by a shock wave from the sun.
![](http://maxcdn.scienceblog.com/wp-content/uploads/2013/02/NASAs-Van-Allen-Probes-Discover-a-Surprise-Circling-Earth-100x100.jpg)
![](http://maxcdn.scienceblog.com/wp-content/uploads/2013/02/NASAs-Van-Allen-Probes-Discover-a-Surprise-Circling-Earth-100x100.jpg)
After most NASA science spacecraft launches, researchers wait
patiently for months as instruments on board are turned on one at a
time, slowly ramped up to full power, and tested to make sure they work ...
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