2015-REP-EARTH-MAGNETIC-FIELD-large570

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Changes measured by the Swarm satellite over the past 6 months shows that Earth's magnetic field is changing. Shades of red show areas where it is strengthening, and shades of blue show areas that are weakening. PHOTO: ESA/DTU

Changes measured by the Swarm satellite over the past 6 months shows that Earth’s magnetic field is changing. Shades of red show areas where it is strengthening, and shades of blue show areas that are weakening. PHOTO: ESA/DTU

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