Anyone who has seen the Northern Lights knows that they are truly incredible, so it’s almost a bummer that they have found out what they actually are. Scientists at the University of California say they are releases of stored energy that happen when stressed magnetic field lines change into a new shape. The researchers say that this occurs more than 100,000 km away. To catch and study the phenomenon, identical satellites were used to trace the sequence from its initial substorm to the appearance of the colored lights.
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