Astronomy Picture of the Day . ... Credit: NASA , Lunar Orbiter 4 Explanation: Looking like a target ring bull's-eye, the Mare Orientale is one of the most striking large scale lunar features. Located on the Moon 's extreme western edge, this impact basin is unfortunately difficult to see from an earthbound perspective. ... The collision caused ripples in the lunar crust resulting in the three concentric circular features visible in this 1967 photograph made by NASA's Lunar Orbiter 4. ...