Earth's magnetic pole shift: ... and found that the time period of the Laschamps excursion—which lasted from about 41,000 to 39,000 BP—coincided with periods of change for groups of humans ...

Solar flares are classified based on their strength and fall into five designated categories: A, B, C, M and X. An X-class solar flare is the most intense type of solar flare and can produce as muc… ...

Observations from Themis show the Earth's magnetic field occasionally develops two cracks, allowing solar wind — a stream of charged particles spewing from the sun at 1 million mph — to ...