太空人在國際太空站（ISS）中會漂浮，這代表他們體驗到的是什麼物理狀態？ Astronauts float inside the International Space Station (ISS). What physical state are they actually experiencing?
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持續的自由落體運動 Continuous free-fall motion 太空站和太空人都在繞著地球做自由落體（向著地球掉落但因為水平速度夠快而永遠不會墜落地面），因此處於失重狀態。 Both the station and the astronauts are in a state of free fall around Earth (falling toward Earth while moving sideways fast enough to keep missing it), creating a sensation of weightlessness.