There is no such thing. There is a FAR side that we can never see from Earth, but no dark side - all of the Moon is in sunlight half the time and in the dark the other half of the time, same as Earth. This is easy to see if you look at the Moon. It has phases and most of the time, the side we can see is not all visible. Some is in the dark.
For example, it is just past First Quarter at the moment so look up at it in the evening (as long as there are no clouds in the way!) and it is easy to see that only half of it is lit up and the other half is in darkness. (I was actually out in late afternoon today and saw this.) Over the next 2 weeks it will continue to appear to grow until the whole circle is lit up - Full Moon. Then as it continues along its orbit around the Earth, it will rise later and later and shrink into a crescent, until New Moon 2 weeks after that, when the side we can see will be completely in the dark and the far side will be completely in the light.
So what the Moon has is a much longer day than ours. Our day and night is 24 hours long, on the Moon it's 29 1/2 Earth days long and that's true everywhere on the Moon. There is no dark side.
So if you want to make sense, talk about the far side, not the dark side because there isn't one.
The Moon is in tidally locked rotation with Earth so the same side always faces us We can never see the other side and people call it the dark side but that's the wrong name for it - it's just the far side. The only way to see it is to send spacecraft round the back to have a look! Then have them send the pictures back once they're round to the near side again and can see Earth. The only people who have ever seen it with their own eyes are Apollo astronauts, because they needed to orbit the Moon.