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January 7, 2013
This artist rendering released Monday by Harvard-Smithsonian Center for Astrophysics shows the different types of planets in the Milky Way galaxy detected by NASA’s Kepler spacecraft. A new analysis of Kepler data found there are at least 17 billion planets the size of Earth.
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Billions of Earth-size planets in Milky Way
Our Milky Way is home to at least 17 billion planets that are similar in size to Earth, a new estimate suggests. That’s more than two Earth-size planets for every person on the globe.
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