10 months ago
Last edited at 6:23PM on 6/20/2013
The reason we cannot see the dark side of the Moon is because the Moon is locked in a synchronized rotation. This means that the time it takes the Moon to rotate once is equal to the time it takes to revolve once. Therefore, one side of the Moon will always face Earth while the other side will never.
Charon, Pluto's moon, provides another example of synchronized rotation.
Because its never facing us. The dark side of moon will never ever face the earth. I suppose you could Google images of the dark side of the moon, but don't be surprised if you get some Pink Floyd stuff ;)
There is no such thing as "the dark side of the Moon". All parts of the Moon get sunlight at one point or another. However, there is a "far side of the Moon". The Moon rotates exactly the same speed as it orbits Earth, and that causes one side of the Moon to always face Earth (the near side), and the other side never faces Earth (the far side). Both sides get sunlight... for example during a solar eclipse the far side of the moon is illuminated. During a "full Moon" phase the near side is illumin8ed.
We can't see the dark side of the moon (the hemisphere facing away from the sun) because not enough light is hitting it and being reflected into our eyes.
I suspect, however, that you actually mean the FAR side of the moon. We can't see this (without going into space or looking at photographs) because the moon is locked in position in relation to the earth by tidal forces. In other words, while the moon orbits the earth, the earth's gravity pulls its closest face towards us. Think of the way the moon can drag whole oceans, and you'll get an idea of how the earth can hold the closest rock-face of the moon in position.
My parting revelation - We actually can see 18% of the far side of the moon every now and then, as the earth and the moon oscillate.