LL>> The Moon rings like a gong when struck by an asteroid
 LL>> or chunk of rock.

 CJ>     So does the Earth after an earthquake.  So does
 CJ> the Sun even in the absence of something striking it
 CJ> ("solar oscillations"). Just because something
 CJ> resonates does not indicate that it's hollow-- tuning
 CJ> forks are not hollow.

 CJ>  The Moon does not have a magnetic core, and is definitely
 LL>> hollow.

 CJ>     The Moon may have had a magnetic core in the past
 CJ> (there are traces of remnant magnetism on its surface).
 CJ> There is no reason whatever to think that it's hollow.
 CJ> Indeed, the seismic stations left by the astronauts on
 CJ> the surface (whence, I suppose, the "gong" remark)
 CJ> indicate the opposite.

and this one point, about the ringing like a gong and the seismic stations,
point that we/someone has been there to have put those stations in place
and to be able to hear the ringing when the moon is struck...

someone's story is flawed >

)\/(ark