We assumed water had to be delivered to planets by comets or asteroids — but a 2025 Nature study found that sub-Neptunes, the most common type of planet in the galaxy, can forge their own oceans by reacting hydrogen atmospheres with molten rock deep insid
Water was thought to arrive on planets aboard comets and asteroids. A 2025 Nature study shows sub-Neptunes, the galaxy's most common planets, can make their own by reacting hydrogen atmospheres with…
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quantamagazine.org·26d agoScientists Debate Whether Earth's Oceans Came from Comets, Asteroids, or Were Homegrown
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