Artist's impression of Kepler-47, the first confirmed binary system with multiple planets (Image: NASA/JPL-Caltech/T. Pyle)
An artist's impression of Kepler-36c viewed from Kepler-36b (Image: Harvard-Smithsonian Center for Astrophysics/David Aguilar)
Kepler's image sensor array
Artist's rendition of the Kepler Space Telescope
It's been more than three and a half years since the Kepler Space Telescope began its mission as humanity's watcher for Earth-like planets outside of the Solar System. In that time, Kepler has done exactly what was asked of it: provide the data to help identify more than 2,300 exoplanet candidates in other star systems. And so NASA has announced the "successful completion" of Kepler's prime mission. There's one nagging detail, though: we are yet to find a truly Earth-like planet. It's time to alter the parameters of the search.
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