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Mini-Neptunes could be irradiated ocean planets

Many known exoplanets today are ‘super-Earths’, with a radius of 1.3 times that of Earth, and ‘mini-Neptunes’, with 2.4 Earth radii. The mini-Neptunes, which are less dense, were long thought to be gaseous planets, composed of hydrogen and helium. Now, scientists from the Laboratoire d’Astrophysique de Marseille (CNRS / Aix-Marseille …

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