Re: Do you think that there is any possiblity to the 'hollow earth theory' ?

Not a chance.

Earth scientists know quite a lot about the interior of the earth. They find out by monitoring earthquake vibrations. Earthquakes, especially big ones, ring the whole planet like a bell, and by carefully observing where the quake vibrations start and where they are detected, seismologists can tell the densities of the layers of the earth through which the waves have traveled.

If the earth were hollow, we'd know.

You may want to check out the US Geological Survey, or Calvin Hamilton's Earth Page for more information. Or just go to your local library.