EntityQ218455· pop 22· linked from 495 articlesorbital spaceflightSign in to savespaceflight where spacecraft orbits astronomical bodyConnectionsdragEntityapsisEntityorbital mechanicsEntityperturbationEntityatmospheric entryEntityChina Manned Space ProgramEntitynon-rocket launchEntityorbital station-keepingEntitynear-equatorial orbitEntityastronomyEntitySoviet UnionConceptYuri GagarinPersonNASAConceptInternational Standard Book NumberEntityouter spaceEntityartificial satelliteEntityInternational Space StationConceptastronautEntityValentina TereshkovaEntityrocketEntityCategories1957 introductionsSpaceflight concepts