RESEARCHERS CLAIM PICTURES SHOW "EXCAVATION" & "UNUSUAL STRUCTURES" ON FAR SIDE OF THE MOON
A study published in the Journal of Space Exploration titled "Excavation" & Unusual Structures" on the Far Side of the Moon" provides an in depth analysis of images taken from Apollo 15 as well as the Lunar Reconnaissance Orbiter. According to the authors, there appears to be “two unusual features in the crater Paracelsus C on the far side of the moon,” the side that is never visible from Earth. By combining multiple images it becomes clear to them that what they are looking at are two walls “on either side of a narrow valley or passageway.”
"Using single image shape from shading and 3D terrain visualization we show in a computer generated perspective view looking northeast that the southwest end appears to be the entrance to the passageway. A reverse angle view looking southwest shows the passageway ending at a rise of terrain at the other end, possibly leading underground. The terrain surrounding the two structures is not flat but appears “excavated ” by some unknown mechanism, natural or artificial. It is shown that these s are visually different from the lunar background because their underlying structure is different."
Reports and hypotheses about artificial structures on the moon are quite common, and have been a common theme for quite some time. In 1963, during the early years of SETI, Carl Sagan spoke about the possibility of extraterrestrial visitation, as pointed out by the study:
"It is not out of the question that artifacts of these visits still exist, or even that some kind of base is maintained (possibility automatically) within the solar system to provide continuity for successive expeditions. Because of weathering and the possibility of detection and interference by the inhabitants of the Earth, it would be preferable not to erect such a base on the Earth’s surface. The Moon seems one reasonable alternative. Forthcoming high resolution photographic reconnaissance of the Moon from space vehicles – particularly the back side – might bear these possibilities in mind."