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Ammonia and hydrogen can separate into distinct, hydrogen-rich and ammonia-rich phases under conditions expected inside some planets. Simulations indicate that the boundary between mixing and separation crosses published temperature profiles for Uranus and Neptune. This suggests ammonia may be raining out inside both planets today, moving from their hydrogen-rich envelopes into ammonia-rich regions. The simulations covered temperatures from 500 to 4,000 kelvins and pressures from 0.1 to 100 g...