| Answer | Crossword Clue |
|---|---|
| semidarkness | A light level in which it is possible to see, but not clearly |
| hyperspace | (in science fiction) A notional space-time continuum in which it is possible to travel faster than light |
| ecosphere | the part of the atmosphere in which it is possible to breathe normally without aid: the portion of the troposphere from sea level to an altitude of about 13,000 ft. (4000 m) |
