achieving
131Socialism — This article is about socialism as an economic system and political philosophy. For socialism as a specific stage of socioeconomic development in Marxist theory, see Socialism (Marxism) …
132Single-stage-to-orbit — The VentureStar was a proposed SSTO spaceplane. A single stage to orbit (or SSTO) vehicle reaches orbit from the surface of a body without jettisoning hardware, expending only propellants and fluids. The term usually, but not exclusively, refers… …
