Mercury's 'tail' is longer than thought

U.S. scientists have used sodium atoms to determine Mercury's comet-like tail is much longer than had been thought.

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<p><a href="http://www.physorg.com/news123340373.html">Mercury's 'tail' is longer than thought</a></p> <p>U.S. scientists have used sodium atoms to determine Mercury's comet-like tail is much longer than had been thought.</p>