heaviness, weightiness

zero gravity, microgravity, spaceflight, parabolas, astronaut, cosmonauts, spacecraft, motion sickness, spacesuit, spaceship, soyuz, extravehicular, cosmic radiation, orbiter, antigravity, orbital, outer space, spaceward, spacemen, gravities, spacewalker, circumlunar, jet propulsion, hypersonic, airlock, space shuttle, decompression sickness, taikonaut, disorientation, flight simulator, shuttle, blastoff, lunar module, acrophobia, capsule, ornithopter, airfoils, drogue parachute, basilar membrane, airsickness, lander, sideslip, tactile sensation, retroreflector, decompression chamber, liftoff, dihedral, valentina tereshkova, nausea, lunar excursion module, hypervelocity, centrifugal force, geosynchronous orbit, spacewalks, orbital velocity, aquanaut, autorotation, turbulence, mesosphere, retrorockets, splashdown, curvature, ballistic trajectory, airship, spacewoman, levitation, upstroke, spacefaring, perilune, meteoroid, gliders, paraesthesia, huygens, wild blue yonder, vtol, rovers, altitude, earthwards, nitrogen narcosis, simulator, martian, levitate, groundspeed, flight, windblast, paresthesia, sols, payloads, faintness, astronautics, laminar flow, bungee, magnetic dipole, vertigo, limitlessness, pelvic girdle, airglow, cosmos, space, parachutes, claustrophobia, discomforts, absence, blindness, unconsciousness, euphoria, helplessness, invisibility, exhilaration, immobility, impotence, impotency, muteness, stagnation, vacuum, eclipse, estrangement, imbecility, incapacity, nothingness, oblivion, cessation

airiness, buoyancy

weight

lightness