The document summarizes several Mars missions including Odyssey which arrived in orbit in 2001, the rovers which landed in 2004, and the Mars Reconnaissance Orbiter (MRO) which arrived in orbit in 2006 and is currently collecting data. It notes that the Mars Phoenix mission launched in August 2007 and will land on the icy northern pole of Mars in May 2008 where it will use a robotic arm to dig trenches in the water ice layers which could contain organic compounds necessary for life.