PROFESSOR BRUCKNER'S THEORY The discovery of the Bottomless Crevasse
       in Greenland by Dr. Nera Vivaldi supports my theory that the earth is
       not solid, as has been thought, but that it is hollow. The Bottomless
       Crevasse is probably the sole route from the earth's surface to a vast
       "Underground Kingdom." The only other possible link would be an
       underground river, flowing in alternating directions in response to
       the tides, but this seems unlikely. How, you may ask, was the earth
       hollowed out? My studies show that more than a billion years ago a
       tiny black hole collided with our planet and lodged in its center,
       pulling the whole molten core into an incredibly massive sphere only a
       few hundred meters across. If you were to stand on the inner surface
       of the earth, like a fly on the inner shell of an enormous pumpkin,
       you would see the black hole directly overhead, like a black sun. The
       gravity of the earth's thick shell would hold you to the inner shell
       of the earth, though you would weigh much less than you would on the
       outer surface because the mass of the Black Sun would tend to pull you
       toward it. If there were a very tall mountain in the Underground
       Kingdom and you were to climb to the top of it, you might be pulled up
       into the Black Sun because gravity gets stronger as you approach a
       massive object. In all other respects the Black Sun would not be
       dangerous to any creatures in the Underground Kingdom. On the
       contrary, the Black Sun would be necessary to life in the underworld,
       but in the opposite way that the sun is necessary to life on the
       earth's surface. Our sun gives us heat and keeps us from freezing. The
       Black Sun absorbs heat. If there is an underground kingdom, it is the
       Black Sun that keeps its inhabitants from being baked to death by the
       heat within the earth!
 (DIR) continue