A Mysterious 'Not-Aurora' Called STEVE Lights The Sky Purple, And We Finally Know How
By MICHELLE STARR
(Krista Trinder/NASA Goddard)
The mysterious purple skyglow named STEVE was unmasked last year. Physicists proved that STEVE was not a new kind of aurora - in fact, it's not any kind of aurora at all. But that still left one big, gaping question: What exactly is it?
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