NASA's robots will either explore Titan or study a comet

NASA's New Frontiers program consists of a series of unmanned missions with the intent of exploring the solar system. The missions are designed to target specific goals as defined by the broader planetary community. Yesterday, NASA announced the two finalists for a robotic New Frontiers mission, with a planned launch in the mid-2020s. One is a sample return mission to a comet; the other is to explore Saturn's moon Titan. The first mission, called CAESAR, or Comet Astrobiology Exploration Sample Return intends to send a spacecraft back to 67P/Churyumov-Gerasimenko. This is the same comet that the ESA spacecraft Rosetta explored.