Rotation periods from the K2 Campaign 9

The Kepler mission is a powerful tool for the study of different types of astrophysical objects or events in the distant universe. However, the spacecraft also provides an...开普勒任务（Kepler Mission）是用于研究遥远宇宙中各类天体物理天体或天体事件的强有力工具。然而该航天器同时也提供了……