Rare transit of Mercury

Scientists from Williams College and the University of Arizona observed Mercury in front of Venus from vantage points on earthbound mountains and with orbiting spacecraft on Wednesday.

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<p><a href="http://www.physorg.com/news81692334.html">Rare transit of Mercury</a></p> <p>Scientists from Williams College and the University of Arizona observed Mercury in front of Venus from vantage points on earthbound mountains and with orbiting spacecraft on Wednesday.</p>