The aurora borealis, in a rare appearance above Kansas, is the most visible sign of the field that shields earth. Photo: AP

Earth was hit by a Mercury-like body early in its history, study finds

Young planet's collision with a Mercury-like body may have led to creation of the magnetic field that protects life from the deadly radiation of space

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The aurora borealis, in a rare appearance above Kansas, is the most visible sign of the field that shields earth. Photo: AP
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