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Home A close encounter between a comet and Mars in 2014 flooded Mars with an invisible tide of charged particles. The comet’s strong magnetic field temporarily merged with, and overwhelmed, the planet’s weak magnetic field, as shown in this artist’s depiction. NASA’s MAVEN mission monitored the effects. (NASA/Univ. of Colorado) A close encounter between a comet and Mars in 2014 flooded Mars with an invisible tide of charged particles. The comet's strong magnetic field temporarily merged with, and overwhelmed, the planet's weak magnetic field, as shown in this artist's depiction. NASA's MAVEN mission monitored the effects. (NASA/Univ. of Colorado)

A close encounter between a comet and Mars in 2014 flooded Mars with an invisible tide of charged particles. The comet’s strong magnetic field temporarily merged with, and overwhelmed, the planet’s weak magnetic field, as shown in this artist’s depiction. NASA’s MAVEN mission monitored the effects. (NASA/Univ. of Colorado)

A close encounter between a comet and Mars in 2014 flooded Mars with an invisible tide of charged particles. The comet's strong magnetic field temporarily merged with, and overwhelmed, the planet's weak magnetic field, as shown in this artist's depiction. NASA's MAVEN mission monitored the effects. (NASA/Univ. of Colorado)

A close encounter between a comet and Mars in 2014 flooded Mars with an invisible tide of charged particles. The comet’s strong magnetic field temporarily merged with, and overwhelmed, the planet’s weak magnetic field, as shown in this artist’s depiction. NASA’s MAVEN mission monitored the effects. (NASA/Univ. of Colorado)