Close Comet Flyby Threw Mars’ Magnetic Field Into Chaos – NASA https://www.nasa.gov/centers-and-facilities/goddard/close-comet-flyby-threw-mars-magnetic-field-into-chaos/
Just weeks before the historic encounter of comet C/2013 A1 (Siding Spring) with Mars in October 2014, NASA’s Mars Atmosphere and Volatile Evolution (MAVEN)
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