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NASA Probe Spotting More Extra-Solar Planets

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Astronomers believe they have evidence that more than 400 new planets exist outside our solar system.

With the help of NASA's planet–hunting satellite known as "Kepler," the new study also tallies the number of potential earth–sized planets.

The total: 17 billion earths... just in our galaxy.

NASA scientists concluding that a *possible* planet the size of earth rotates around one out of six stars in the Milky Way.

Still no sign of actual life outside earth.