We all are familiar with the moon and when we search the images we see the same one all the time. Opposite side bit more unfamiliar. Back side or the far side forever facing away from the earth. Sometimes people believe there are alien civilization preparing invasion out of site. This was until 1959 when the Soviet Union’s Luna 3 probe took pictures of the far side. Today moon rotate as synchronized orbit facing one side. Due to this reason one year of the moon equal to 1 day. This state of the moon called Tidally locked.