noun
microgravity
Scientific term for very weak gravity, such as in orbiting spacecraft.
国際宇宙ステーションでは微小重力環境で実験が行われる。
Experiments are conducted in a microgravity environment on the International Space Station.
無重力 means 'zero gravity' or 'weightlessness', while 微小重力 refers to very low but not completely absent gravity.
Compound of 微小 (tiny, minute) and 重力 (gravity).