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17 Billion Earth-Size Planets

17 Billion Earth-Size Planets

According to a new study, our galaxy hosts at least 17 billion Earth-size planets. This is based on astronomers' calculation that 17% of stars in the Milky Way have a planet similar to the size of Earth in their orbit. Pictured is an artist's illustration showing the variety of planets that have been detected by the Kepler spacecraft. More here.

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