Hypothetical thought experiment; What would happen if you created a very long cylindrical material, eg 100 000km long and took it into deep space. Here you rotate one side of it so the tube is spinning in a large circle with radius 100 000km, ignoring friction and gravity. Once it is spinning, the outer edge will spin faster that the inside as it has a greater distance to travel and is doing this in the same time etc. If the object was sped up to travel 50-99% the speed of light*, time and space would bend in order for the outer edge to speed up to allow the edge to spin faster, without exceeding the speed of light. I suppose that the mass of the outer side would increase while time would slow down, and the object would begin spiraling in on itself, in the same way spaghetification occurs in a black hole, however im not entirely sure What would appear to occur for a person with a frame of reference; a. A stationary observer b. An observer standing on the inner edge of the circle c. A person on the outside edge of the circle (Moving closer to the speed of light) Also, i know that to move an object near the speed of light requires and infinite amount of energy, however technically your not moving the outer edge, but instead it is being pulled along by the particle bonds. Would you then still require vast amounts of energy in order to increase the objects speed? This isn't a homework question, it's just something i thought of and has puzzled me for a fair few days, as well as those around me. So if you guys could help with some input, it'd be great. * The speed, whilst still a relatively high value, may not be necessary to answer the question as long as the outer edge of the object is moving faster at near speed of light.