Abstract
It was considered that space environment was completely weightless. Inside spacecrafts, such as the Space Shuttle and the International Space Station, however, the existence of residual acceleration has been reported. The acceleration is called "g-jitter." In a lot of experiments carried out in space, the adverse influence of the g-jitter on their results has been found out. To extend our understanding on the g-jitter, a research group has been organized. Here, some results from researches on the g-jitter are briefly introduced.
