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By Nature
March 1, 2016
![[article image]](https://cacm.acm.org/system/assets/0002/2827/3116.nature.earth_transiting_sun.large.jpg?1476779517&1456867972 "Earth transiting the Sun")
By watching how the light dims as a planet orbits in front of its parent star, NASA's Kepler spacecraft has discovered more than 1,000 worlds since its launch in 2009. Now, astronomers are flipping that idea on its head in the hope of finding and talking to alien civilizations.
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