| Answer | Crossword Clue |
|---|---|
| AXION | Hypothetical particle |
| QUARK | Hypothetical particle |
| GEN | Hypothetical particle. |
| GLUON | Hypothetical particle |
| QUARK | Hypothetical physics particle |
| MONOPOLE | Hypothetical magnetic particle |
| AXION | Hypothetical fundamental particle |
| QUARK | Hypothetical elementary particle |
| AXION | Hypothetical physics particle |
| QUARK | Hypothetical particle, in physics |
| AXION | Hypothetical particle in cold dark matter |
| TACHYON | Hypothetical particle that travels faster than light |
