1) Hypothetical spacecraft
Found on
https://www.crosswordclues.com/clue/starwisp
Starwisp is a hypothetical unmanned interstellar probe design proposed by Robert L. Forward. It is propelled by a microwave sail, similar to a solar sail in concept, but powered by microwaves from a man-made source. == Description == `Starwisp` is a concept for an ultra-low-mass interstellar probe pushed by a microwave beam. It was proposed by s.....
Found on
http://en.wikipedia.org/wiki/Starwisp
No exact match found.
