| 1 | Not only that, but there are three ways that particles can decay. | |
| 2 | Decaying with relatively short lifetime. Used of subatomic particles. | |
| 3 | Any instability or orbital decay can be corrected with thrusters and an onboard engine. | |
| 4 | Neutrinos, which have no charge and very little mass, form out of nuclear reactions and particle decays. | |
| 5 | Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes. |