Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00561-5
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Some nights the Moon looks like a perfect circle, other nights just a sliver. These changes in its shape are to do with the lunar cycle. This is a series of eight unique phases of the Moon's visibility. The whole cycle takes about 29.5 days and these different phases happen as the Sun lights up different parts of the Moon whilst it orbits Earth.
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Watch: Trump outlines objectives for ongoing military operation in Iran