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The moon cycle, or lunar cycle, refers to the moon's phases as it orbits Earth, including new moon, first quarter, full moon, and last quarter, repeating every 29.5 days.
background images of space, stars and planets
Sphere of nightly Earth planet in outer space. City lights on planet. Life of people. Solar system element. Elements of this image furnished by NASA
render of the solar system
Abstract atomic structure concept for scientific research presentation. Futuristic glowing atom featuring blue elliptical rings circling a radiant central core on black background. Vector illustration

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