Are these facts about moon true? I don't have much knowledge of Astronomy but today I was googling randomly and found an article, according to which:


  
  The moon is of the wrong size for its current orbit.
  The moon rings like a bell when hit by an object, which could signal that it's hollow.
  Metal shavings were found in samples taken by the Apollo crew. 
  UFO sightings were common on NASA moon missions.
  All these phenomena and more point toward the suggestion that the moon is actually an artificially created spaceship. It's a bit far fetched, but it's odd that astronomers have been discouraged from testing this theory.
  


Can this theory be true?
Orbital radius depends on speed of the body. Size is largely irrelevant. Imagine a  space craft and much larger space station, able to orbit meters apart at the same speed, with engines switched off. An astronaut going on a spacewalk would be launched away from the station, being much smaller and so on wrong orbit. No. It's as relevant as "Boeing 747 shouldn't be able to fly because it's painted the wrong color." False and based on wrong premise.
For anything to ring you need atmosphere, a medium for sound to travel through. Moon, floating in vacuum, doesn't ring, nor create any other sound for that matter. Even the most powerful meteor impacts are entirely silent. False and based on wrong premise.
Countless iron meteorites hit the surface of the Moon, often shattering on impact. Specks of iron are very common in lunar soil, and I have no doubt it's entirely possible shavings-shaped pieces of lunar meteor might have found their way into the samples. Likely True and nothing odd about it.
...how does that even relate?