Im definitely not an expert in this field but i have a question. From what ive picked up time dilation can be observed when a clock has a velocity or moves away from the centre of earth and it slows/speeds up. In both these cases the clock has more energy, be it potential or kinetic. Could this increase in energy cause the atomic clocks to speed up somehow? I know the increase in energy is small but so is the time dilation. This could be very wrong as i dont quite understand how these clocks work (a semi-simple explanation would be nice), but i feel like it would make sense if they speed up when they had more energy. Im probably wrong but i just want to know why.