What is true is that, at any given moment, half of the Moon is in darkness. But the dark side is always the side that faces away from the Sun. That's also the case with Earth. Half our planet experiences day while night occurs on the other half. Because the Earth and Moon rotate (spin), some areas are moving into sunlight as different areas move into darkness. Earth rotates once a day, while the Moon takes 27.3 days to spin once.
So, remember, half the of Moon is always dark, but that half is constantly changing.
(source: astronomy.com )
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