Getting Up There. To Meet the Aliens?

Rocket science is supposed to combine the mathematical, engineering and mechanical expertise needed to design, assemble, test, and launch rockets into space; it is a gigantic technical enterprise. Spacecraft are divided into several categories, depending on the load or mass of the cargo and the destination. Unknown heroes are the commercial satellite delivery systems that lift light and medium loads into low Earth orbit, polar or geostationary orbit. #ufo #rockets