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Jonathan Fortney: The Typical Planet in our Galaxy?

Artist depiction of a starsystem with exo-planets. Credit: NASA/JPL-Caltech, NASA/JPL-Caltech, ESO

Artist depiction of a starsystem with exo-planets. Credit: NASA/JPL-Caltech, NASA/JPL-Caltech, ESO

SETI talks presents Jonathan Fortney who talks about how the NASA’s Kepler Mission has revealed that the most common size of planet in our galaxy may be those from 2-3 Earth radii. Such medium-sized planets are significantly more common on close-in orbits than Neptune and Jupiter-class giant planets. We have no analog for these planets in our solar system. What are they made of?

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