1) Spacecraft propulsion
Found on
https://www.crosswordclues.com/clue/space-tug
A space tug is a type of spacecraft used to transfer payloads from low Earth orbit (LEO) to higher energy orbits such as geostationary transfer, lunar transfer, or escape trajectory. The term is often used to describe reusable, space-based vehicles, such as NASA`s 1970s STS proposal or the proposed Russian Parom, and sometimes used to refer to ex....
Found on
http://en.wikipedia.org/wiki/Space_tug
No exact match found.
