before i ask my question i want to review two points: 1. place a body like a moon or a planet near a black hole, as the body approaches the extreme gravity affects the body deferentially. 2. review the tidal forces on Jupiter's moon Io leading to volcanic/tectonic consequences. now take an identical copy of the earth and let it head through space with a velocity close the speed of light. even at these fantastic speeds nothing would be different on this new earth as compared to the original. however, the copy earth is still rotating so the side that is rotating into the direction of travel is getting even closer the speed of light. while the opposite side rotating away is going slower. even though this difference in velocities is only about 1 km/s can speeds sufficiently close to the speed of light yield a differential tidal force across the planet resulting affects on the geologic behavior of the planet [i.e. earthquacks, tectonics, etc...]?