What causes an atom to decay? To tell you the truth, it doesn't even have to be an atom, it can be a proton, a neutron, an electron. My question really is what causes a life to end. I know everything has a life but why? Energy doesn't have a life. Then why can't an atom live forever? Ok, if it is being provided a theoretically perfect environment which would ensure that nothing damages it, then would it life forever? I heard that we have technology now to keep humans alive for a 1000 year but you will have to be locked in a room, no radiation, no scratches, good circulation, heartbeat, etc., will be ensured. Sorry off the topic, just felt like sharing, might be a rumor.