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NASA's MAVEN Spacecraft Arrives on Mars

A U.S. spacecraft has arrived at Mars to study the planet's upper atmosphere and help scientists answer questions about how its climate has changed over time. The craft named the Mars Atmosphere and Volatile Evolution, or MAVEN, completed a 10-month, 711 million-kilometer journey late Sunday. It will measure the rates at which gases escape the Martian atmosphere into space.   Bruce Jakosky, who is leading the science side of the mission, said the goal is to understand what...

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