Granular behavior in microgravity

A granular system is a new kind of condensed matter, for which a full dynamic description is still not available. An understanding of granular behavior in microgravity is of great importance not only for basic research in physics but also for the exploration of space. In this article we summarize the achievements obtained so far in the study of granular motion driven by vibration under microgravity conditions. Future research in this field is also discussed.