
1) Science fiction theme
Found on
https://www.crosswordclues.com/clue/torchship

Torchship (or torch ship) is a term used by Robert A. Heinlein in several of his science fiction novels and short stories to describe fictional rocket ships that can maintain high accelerations indefinitely, thus reaching speeds that approach the speed of light. The term has subsequently been used by other authors to describe similar kinds of fict...
Found on
http://en.wikipedia.org/wiki/Torchship
No exact match found.