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What are Moon phases?NASA says the Moon takes around 29.5 days to circle Earth, moving through a set of eight distinct phases along the way. Even though we always see the same side of the Moon, the portion lit by the Sun changes as it travels, which is why it can look full, half-lit, or barely visible at different points in the cycle. These changing views are what we call the lunar phases, and there are eight in total:
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