出典:Wikipedia
出典:『Wikipedia』 (2011/06/30 06:49 UTC 版)
Weightlessness (or zero-g) is the condition that exists for an object or person when they experience little or no acceleration except the acceleration that defines their inertial trajectory, or the trajectory of pure free-fall. The physical path of an inertial trajectory depends only on the direction and strength of the sum of the gravitational attractions outside of the inertial reference frame.
弱々しいこと
the state of something being weightless
むだなこと