This mission turned up 1,284 new planets. Name the mission whose goal was to investigate planetary systems.

In 2009, Kepler was launched with one mission in mind: to "explore the structure and diversity of planetary systems". K1 returned to Earth in 2013, and K2 continued its mission shortly after. The original had already discovered 1,284 exoplanets, nine of which were in a "habitable zone".

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