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Originally Posted by Yakk
Another fun structure is the heavy hollow tube. Things inside the tube are pulled towards a plane that cuts the tube into two equal-sized tubes. I believe the strength of the pull goes up as you move further away from the plane, to a limited extent.
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I see good clean potential for some fun with this. Stand on one end, jump in... and just keep bouncing back and forth from one end to the next.
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An interesting question: going back to the heavy, hollow shell -- is there any effects when accellerate and move from point to point?
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Do you mean accelerate the sphere you are in? If I remember right you will remain in the same location as the sphere, until you collide into the side. Since the net forces on you inside are zero, you should remain still.
Someone else read J. Richard Gott's
Time Travel in Einstein's Universe. He proposes if you take the mass of about 6 Jupiter's, collapse it into a spherical shell 10m diameter of the hollow and 12m overall diameter, you will bend space enough that your time will slow down significantly.
Just some fun effects of gravity.