'Water Worlds' Are Common In Milky Way, Says Research. So Why Not In The Solar System?
New research into data on exoplanets suggests that 'super-Earths' and water-rich 'sub-Neptunes' between two and four times bigger than Earth are likely to be water worlds containing at least 25% water-dominated ices or fluids, and not the gas dwarfs with a rocky core than many astronomers thought.
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