One of the exciting adventures of astronomy is to find other planets like the earth orbiting other stars. The first such planet was found in 1992. On March 6, 2009, NASA launched a planet-hunting satellite called Kepler. Its job was to stare at a spot in the sky containing 150,00 stars, in the Constellation Cygnus, looking for dips in starlight as an orbing planet passed between us and its sun. Kepler collected this data in two missions.