#TBT to 2009, when the Kepler Space Telescope began its mission to find planets beyond our solar system. Kepler ran out of fuel and was officially retired this week, but only after discovering more than 2,600 planets and observing more than half a million stars. Farewell Kepler! 🔭🌌 . . . . . . . . . . #kepler #space #exoplanet #faraway #cosmos #life #aliens #NASA #spacemissions #rip #retired #discover #planet #stars #orbit #explore #exploration #throwbackthursday #restinpeace #farewell #greatjob #science