Why we're one step closer to understanding how Earth got its oceans (op-ed)
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![Why we're one step closer to understanding how Earth got its oceans (op-ed)](https://cdn.mos.cms.futurecdn.net/xGG6dBKgmkUEPU7uNKB3EB.jpg)
Earth may have gotten some of its water from 'dark comets,' and the forthcoming Vera C. Rubin Observatory could uncover key clues about these mysterious cosmic bodies.