"The sun exploded again in July 2012, spewing material toward Earth at nearly 6 million miles per hour. This time the coronal mass ejection hit a NASA spacecraft called STEREO-A at full-blast. The spacecraft’s sensors were stressed, but they still managed to measure the solar particles, gusts of solar wind and the strength of the interplanetary magnetic field.
A year after the explosion, in a paper published in the journal Space Weather, astrophysicists examined the STEREO-A data to answer a worst-case question. “What if that coronal mass ejection had occurred 10 days earlier, when the Earth was in the line of fire?" said Daniel Baker, a professor of planetary and space physics at the University of Colorado at Boulder and one of the authors of the study.
Their conclusion: If it had hit Earth, Baker and his colleagues wrote, there was a “very legitimate question of whether our society would still be ‘picking up the pieces.’"
https://www.washingtonpost.com/news/speaking-of-science/wp/2018/08/09/this-nasa-spacecraft-is-about-to-probe-one-of-earths-scariest-threats-the-sun/?utm_term=.993e2a4f412c
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