A control law, that constrains the state to follow the sliding mode in the state space, is designed on the basis of a nonlinear, simplified model of the completely liquid-filled spacecraftdynamics.
New spacecraft like the Solar Dynamics Observatory could help answer some of these questions.
像太阳动力观测卫星这样的新航天器也许能够帮助人类解答一些疑问。
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On Oct. 7, 2010, NASA's Solar Dynamics Observatory, or SDO, observed its first lunar transit when the new moon passed directly between the spacecraft (in its geosynchronous orbit) and the sun.