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Fulton gap

(radius valley)
(planets with radius 1.5 to 2 Earth radii are rare)

The Fulton gap (or radius valley) is an interval of planet radii (1.5 to 2 Earth radii) within which extra-solar planets are apparently rare.


(exoplanets)
http://en.wikipedia.org/wiki/Fulton_gap
https://arxiv.org/abs/1706.06204

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