Fourth orbiter to arrive at Mars on Friday

NASA's Mars Reconnaissance Orbiter is approaching Mars and, if maneuvers go well, will join three other Earth spacecraft in orbit around the planet.

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<p><a href="http://www.physorg.com/news11430.html">Fourth orbiter to arrive at Mars on Friday</a></p> <p>NASA's Mars Reconnaissance Orbiter is approaching Mars and, if maneuvers go well, will join three other Earth spacecraft in orbit around the planet. </p>