Our moon has a far side but not a dark side. And that then means that you don't have to be distorting the shape of the body by moving tidal bulges around the solid surface of the body because the total bulges can stay fixed in place facing towards underway from the planet. Tidal forces have slowed down each moon's rotation, suddenly it rotates exactly once per orbit.
Now why does this happen? Well, it's due to tides. And, if you're on the surface of the far side of any of these moons, you wouldn't be able to see the planet because it would be below the horizon. The opposite side, the far side, always faces away from the planet. So one side, the near side, always faces towards the planet. Now, like almost every known moon in the solar system, the moon has this property of rotating once for every orbit it makes round its planet. Metaphorically it's dark but it's misleading. So let's get rid of this phrase “the dark side of the moon”. In fact, a little bit more because on the far side of the moon you never see the Earth getting in the way of the sun. But it's no darker than the near side, it sees just as much sunlight as the near side of the moon does. That's the side of a moon that permanently faces away from the earth. The Chinese landed on the far side of the moon.
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