NASA picks another Mars flight to explore its core

The space agency decided Monday to launch a relatively low-cost robotic lander in 2016 to check out what makes the Martian core so different from Earth's. NASA's Discovery program picked a project called Insight over missions to a Saturn moon and a comet, drawing complaints from scientists who study other places in our solar system that NASA is too focused on Mars. All three proposed missions were good, but the Mars one showed the best chance of making it within budget and on schedule, said NASA sciences chief John Grunsfeld. The missions cost no more than $425 million.