分子外流标志着恒星形成早期演化的一个重要阶段。
Molecular outflows mark an important phase in the early evolution of star formation.
可见，行星状星云是恒星晚年演化的结果。
Obviously, a line of astroid nebula is a result which the star old age evolves.
恒星核心必将再度收缩，恒星不可抗拒地要演化到最后的状态。
The core again contracts, and the star's evolution proceeds inexorably to the final state.
恒星的自转，是恒星结构和演化理论的难点。
Stellar rotation is a difficult problem of the theory of stellar structure and evolution.
恒星的自转，是恒星结构和演化理论的难点。
Stellar rotation is a difficult problem of the theory of stellar structure and evolution.
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