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Six years after last landing on Mars, NASA is sending a robotic geologist to dig deeper than ever before to take the planet's temperature.The Mars InSight spacecraft, set to launch this weekend, will also take the planet's pulse by making the first measurements of "marsquakes". The $1 billion U.S.-European mission is the first dedicated to studying the innards of Mars. By probing Mars' insides, scientists hope to better understand how the red planet -- any rocky planet, including our own- formed 4.5 billion years ago.The point is to test the two CubeSats as a potential communication link with InSight as it descends to the red planet on Nov. 26 .The success rate, counting orbiters and landers by NASA and others, is only about 40 percent. The U.S. is the only country to have successfully landed and operated spacecraft on Mars. The 1,530-pound (694-kilogram) InSight builds on the design of the Phoenix lander and, before that, the Viking landers.InSight's science objectives, however, are reminiscent of NASA's Apollo program.
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