Why Do We Only See One Side of the Moon?

One of my favorite readers, Zrinka, asks why we can see only the aspect of the moon from Earth. Seriously, see the different stages; we always see the same side of the moon:

How did this happen? Well, the moon turns around the earth about every 29 days, so the phases of the moon will happen. However, the moon also rotates every 29th day. Therefore, the same side of the moon is always facing the earth.

This is called "lock". By the way, we are not the only system like this. Mars satellites Phobos and Deimos all face Mars. All the satellites of Jupiter, Saturn, Uranus, Neptune are fixed to those planets. In a very strange situation Pluto and its biggest satellite, Charon, lock each other, so the two always show the same face to each other:

But what is the cause of this? Why is the moon fixed to the planet they are orbiting? Like all the others in the solar system, the cause is gravity. When you get up, the earth will lower you. But your feet are closer to the center of the earth than your head. This small difference means that the earth is pulling your lower half with gravity slightly larger than the upper half; this small difference is called tidal power. When something like the moon is close enough to the planet, these gravity tidal powers will cause the moon to rotate at the same speed as the planet. When this occurs, we call it a tidal lock, that's why we always see the same side of the month!

This also applies to all planetary satellites we know. In fact, based on what we know, we say that our planet Gliese 581 c is completely fixed in the sun, just as our moon is fixed to us I believe. It is very simple.

Update: This is some pictures for you to compare. The first one is "in front of the moon", that is always the side that fits us.

Next is the side you do not see from the earth, "far away", or the side always facing the earth.

These pictures are the first astronomical data that I worked as undergraduate (Clementine Spaceship) (early 1998). Is it different in these points? And now you will never see you Know the details about the moon aspect!

The simple answer (and the answer you may have asked before) is that you can only see one side of the moon. The moon rotates around the earth at exactly the same speed as its own axis, and the moon is always facing the ground. This means that the day of the month (meaning the length of time it takes for the month to go around) is about 4 weeks. If the moon does not rotate at all, you can see all its edges, but the only way you can see such a constant lunar surface is when it is spinning. There is a good visualization below

When the moon and the sun are on both sides of the earth, we think the moon has been completed. But when the sun and moon are on the same side of the earth, we say the moon is "new". During the new moon, the aspect of the moon we can see from the earth is not exposed to direct sunlight at all. Between the new moon and the full moon, the moon is a new moon (less than half is illuminated). Then the wax - will grow - it will be a half moon (half illumination). At that point the month is one quarter of the cycle of the month, so the first half of the month following the new moon is called the first quarter. After the first quarter, there was a rising month (more than half had been illuminated), and lastly there was a full moon

Technically, the moon does not have a real 'dark side'. As I mentioned above, the moon has not yet been seen but it is still spinning but from our point of view the other side will still be exposed to the sun on that day "Sun." Indeed, the "dark side" of the moon is really completely dark only when we see the full moon.