that a spinning gyroscope does not topple has not much to do with Mach, Einstein, the universe or any such big idea. I can explain it much more simply. Conside

that a spinning gyroscope does not topple has not much to do with Mach, Einstein, the universe or any such big idea. I can explain it much more simply. Consider a gyroscope spinning fast. so if all of a sudden you try a push its top northward then that instantaneous force pushes down on the north edge of the disk and up on the south edge.Those specific parts of the disk acquire momentum. However because the disk is spinning, the part of the disk that was north soon becomes south. and the southern piece that was moving up is now north. now the momenta of the influenced disk segments act to right the gyroscope. The same effect can occur during the acceleration of a gyroscope in a missile in space. Even tho there is no gravity. The effect of acceleration on the gyroscope is the same, causing it to maintain its orientation in space. The faster a gyroscope spins, the more quickly it rights itself. and thus appears more stable. as it slows down, the righting effect fails. Angular momentum is a man made calculation and the upward pointing arrow is really just a make believe thing. If it were a real force, the whole gyroscope should float upwards. LOL. It is a shorthand to represent the average momenta of the influenced parts of the gyroscope.