Imagine standing in a room with a friend. The friend walks around you in circles, but is always facing the front of the room.
Do you see the friends face constantly, or do you see all sides of their head?
Because they aren’t rotating, but where they are compared to you is constantly changing, you would be able to see all sides of their head.
Now, instead of constantly facing the front of the room, your friend now constantly turns as they circle you so that they are always facing you.
Now that your friend is turning to face you, you are no longer able to see the back of their head. But this situation requires the friend to constantly turn as well as walk around you. This is what is happening with the moon and only one side ever facing the earth.
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