| Answer | Crossword Clue |
|---|---|
| WORMHOLE | Hypothetical feature of the space-time continuum |
| subspaces | (in science fiction) A hypothetical space-time continuum used for communication at a speed faster than that of light |
| subspace | (in science fiction) A hypothetical space-time continuum used for communication at a speed faster than that of light |
| COSMICSURGERY | Fixing the space-time continuum? |
| strings | (in cosmology) A hypothetical threadlike concentration of energy within the structure of space-time |
| hyperspace | (in science fiction) A notional space-time continuum in which it is possible to travel faster than light |
