Rocketry.
NASA's George C. Marshall Space Flight Center is located in Huntsville, Alabama. It is NASA's Center of Excellence for research in civilian rocketry and spacecraft propulsion.
Robert Goddard is the father of modern rocketry...:D
Model Rocketry - magazine - was created in 1968.
Model Rocketry - magazine - ended in 1972.
General Leslie Earl Simmon is the father of army rocketry
Actually, the Father of Modern Rocketry was Robert H. Goddard.it is Tsiolovsky.
Propulsion
A possible word for space science ending in -try would be rocketry. Rocketry relates to how rockets work, and rockets are the only thing currently used to travel through space. Rocketry also ends in the suffix -try, so rocketry is a possible word.
Tsiolkovsky
Godard.
goddard