The name “dark side” isn’t accurate really, both sides of the Moon recieve the same amount of sunlight. However, we can never see that side from Earth because the Moon is tidally locked. Basically, because of the way gravity works over very long periods of time, the Moon is spinning exactly fast enough such that one side always faces Earth. A lunar day is exactly one lunar cycle long. Seen from the Moon, Earth has phases which are 24 hours long, the difference bwtween them being literally night and day.
If you look around during the day, you can sometimes see the moon, but because moonlight is reflected sunlight it’s dim.
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