NASA’s next mission will either grab part of a comet, or bop around one of Saturn's moons

Which one will win? We'll find out in 2019. Which new frontier will we head towards? On Wednesday, NASA narrowed that choice down to two with an announcement proclaiming that their next New Frontiers mission would either play tag with the comet 67P/Churyumov–Gerasimenko or hopscotch around Saturn...

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