A barrage of comets may have delivered Earth's oceans around 3.85 billion years ago, a new study suggests. Scientists have long suspected that Earth and its near neighbors were walloped by tens of thousands of impactors during an ancient event known as the Late Heavy Bombardment. This pummeling disfigured the moon, leaving behind massive craters that are still visible, preserved for millennia in the moon's airless environment. But it's been unclear whether the impactors were icy comets. (source: news.nationalgeographic.com)
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