The far side of the moon...

Did you know that we're always looking at the same hemisphere of the Moon from Earth ?

The Moon rotates synchronously with Earth and so we can only see one side of it from Earth; which means that we can never see what is on the other side of the moon from earth ! The side that we see is called the Near Side of the moon while the other side is called Far Side of the moon. The only people who have seen the far side are the astronomers who landed on the moon. Also, this is not to be confused with the Dark Side of the moon - this is the shadow region on the near side of the moon; in plain language it means the dark parts on the near side on which there is no sunlight falling.

And here is another strange fact; the Moon is moving away from Earth each year ! This causes the Earth to slow down its rotation; so in a few million years, a day will be longer than 24 hrs ! And eventually, the Moon-Earth will be in synchronous locked rotation; which means that not only will we see only a part of the Moon (like now) but the Moon will be fixed in the Sky over a spot! The moon will not be visible from the other parts of the Earth !! This is like having a geo-stationary satellite !! The Moon will seem to be fixed in space above the Earth.

Such a phenomenon is observed in nature; the planet, Pluto and its moon Charon are such a locked -system !