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Skygazers across a broad swathe of the Northern Hemisphere will have a chance to see the Moon take a bite out of the Sun on Saturday when a partial solar eclipse sweeps from eastern Canada to Siberia.

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People have always studied the skies to predict the weather, but recently scientists have noticed that clouds are changing on a global scale -- posing one of the greatest challenges to understanding our warming world.

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It covers nearly three-quarters of our planet but the ocean floor is less mapped than the Moon, an astonishing fact driving a global push to build the clearest-ever picture of the seabed.