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Originally posted by bobbylove321
I hear a lot of people talking about how the earth can't be hollow and how it's impossible for a civilization to live under earth, bla bla bla. But if you actually think about it then it all makes sense.
Byrd flew over the North Pole in 1926 and over the South Pole in 1929, but he didn't see these entrances to the nether world. It is pointless to point out this fact or to refer hollow earthers to satellite photographs that do not show holes at the poles.
Originally posted by Alexander_Supertramp
reply to post by bobbylove321
The problem is that Earth wouldn't be heavy enough to stay in the orbit that it is in. I'm no expert but a hollow Earth would make a pretty big mass difference.
The goemetry is quite simple. If a sphere's center is "C" and its radius is "r," then every outside point "P" maps to an inside point "P'" such that "CP x CP' = r2 [ "r squared" ] Here's a good way to visualize it: For any outside point "P" (on the sun, or Pluto, or Cygnus X, for example), draw a circle that has "CP" as its diameter. From one of the two points where this circle intersects the earth, draw a line perpendicular to "CP." The intersection point (of this perpendicular and "CP") is the location of "P'". By far the largest body in our inverted Earth is the moon; a bit over half a mile in diameter and some 3,933 miles over our heads. The sun's sphere is only eight feet across. The stars are microscopic spots clustered around the center, which is, of course, infinity. Is there any way to prove we *aren't* inside a hollow earth? We asked H.S.M. Coxeter, mathematics professor at the University of Toronto and an expert on inversion geometry. "I can't think of any," he said. "A rocket flight, an eclipse, a Foucault pendulum, a Coriolis effect -- any observation we can make on the outside of the earth has an exact duplicate version inside. There would be no way to tell which was the truth."