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Earth is spinning on its axis, completing one rotation every 23 hours, 56 minutes, and 4.1 seconds. That spin brings us day and night, makes stars appear to rise and set, and contributes to the general habitability of our planet. Rotation plays a role in the tides, along with the circulation of the atmosphere and oceans. So what would happen if Earth stopped rotating? Don’t worry about “how” or “why”; just think about the end result. The consequences tell us a lot about how our planet functions — as well as other worlds in the galaxy.