Scientists think big impact caused two-faced Mars

(AP) -- Why is Mars two-faced? Scientists say fresh evidence supports the theory that a monster impact punched the red planet, leaving behind perhaps the largest gash on any heavenly body in the solar system.

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<p><a href="http://www.physorg.com/news133617553.html">Scientists think big impact caused two-faced Mars</a></p> <p>(AP) -- Why is Mars two-faced? Scientists say fresh evidence supports the theory that a monster impact punched the red planet, leaving behind perhaps the largest gash on any heavenly body in the solar system.</p>