Synonyms and related words :
airiness, ascent, asteroids, aurora particles, blackout, bubbliness, buoyancy, cosmic particles, cosmic ray bombardment, daintiness, delicacy, downiness, ethereality, floatability, fluffiness, foaminess, frothiness, gentleness, gossameriness, intergalactic matter, lack of weight, levitation, levity, lightness, meteor dust impacts, meteors, radiation, softness, space bullets, tenderness, the bends, unheaviness, volatility, yeastiness