I know that at one time the earth was thought to be flat. Then it was proven to be round (spheric). I believe everything in life is hollow even ourselves. Example a mother's womb, our digestive track. I use the same analogy to apply that the earth and other planets are hollow with a north pole entance, and south pole entrance. I know the present theory is that the earth is solid with a hot core. Can you tell me what you thinkl?I know that we have not gone deep enough into the earth's crust. We do not have the proper equipment. The furthest we have digged is about 8 to 12 miles deep.To clarify it more, convex and concave with two entrances one in North Pole and South Pole currently guarded by ice almost impennetrable. Skimo folklore describe a northern land full of greens , trees, birds etc. Think of it as an inflated balloon with a thick crust with entrances at both extremes, gravity on the center of the crust, and a central sun. This may explain the Aureola Australis and Borealis known as Southern and Northern Lights .