http://www.mufor.org/moon.htm

http://www.quiknet.com/~maxsmoke/moonstuff.html

back in the 1970's two Soviet scientists from the Soviet academy of sciences proposed the theory that the moon was a Hollow Alien Spaceship placed in orbit around the earth.

There has often been speculation, even amongst Astronomers and scientists, that Phobos, one of the Moons of Mars may be Hollow. Its strange orbit is cited as one of the reasons - plus many strange markings on it and a "huge" crater which covers about 1/4 of its surface area