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Close comet flyby threw Mars’ magnetic field into chaos

10 March 2016 Astronomy Now

The close encounter between comet Siding Spring and Mars in October 2014 flooded the planet with an invisible tide of charged particles from the comet’s coma, according to data from NASA’s Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft. The comet’s powerful magnetic field temporarily merged with, and overwhelmed, the planet’s weak field.

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Mars spacecraft safe after fortuitous comet encounter

20 October 2014 Stephen Clark

A fleet of robotic spacecraft orbiting Mars got a front row seat to space history Sunday and lived to tell about it, giving scientists their first close-up look at a comet fresh from a cloud of primordial mini-worlds at the outer reaches of the solar system.