proxima centauri, geosynchronous orbit, synchronous orbit, occulted, geostationary orbit, milky way galaxy, large magellanic cloud, undocked, epsilon aurigae, celestial sphere, space capsule, andromeda galaxy, eclipsing binary, spiral galaxy, prograde, orbital velocity, small magellanic cloud, celestial equator, oort cloud, retrogrades, planetary nebula, tarantula nebula, omega centauri, asteroid belt, space shuttle, annular eclipse, zodiacal light, circularize, launch vehicle, radial velocity, neutron star, tycho brahe, lunar excursion module, hubble constant, gravitational interaction, booster rocket, canis major, taikonaut, yuri gagarin, lunar module, corona australis, cosmic dust, interstellar medium, alan shepard, sundog, alpha centauri, syrtis major, imaged, valentina tereshkova, cosmic ray, edmund halley, interplanetary dust, ionise, meteorological satellite, edwin hubble, corona borealis, deep space, harlow shapley, circumnavigated, camelopardalis, celestial mechanics, spacefaring, manned, beta centauri, horsehead nebula, undock, interstellar space, ballistic trajectory, optical telescope, gravitational attraction, astronomical telescope, circled, outer space, commanded, space station, johannes kepler, canes venatici, cosmonaut, drogue parachute, aurora australis, hadean eon, recrystallized, rendezvoused, canis minor, voyaged, nitrogen tetroxide, gamma rays, angular momentum, nicolaus copernicus, flight engineer, meteor shower, cepheid variable, subatomic particle, vernal equinox, ionize, particle beam, transits, christiaan huygens, cosmic rays, coma berenices, launch pad, disintegrated

apoapsis, periapsis, point of apoapsis, point of periapsis