理查德·拉尔森，一个耶鲁的天文学家，他研究星系核中的恒星结构，他说，星系在整个生命史中，可能会经历好几个类星体的阶段。
Richard Larson, a Yale astronomer who studies star formation in galactic nuclei, says galaxies can go through several quasar phases during their lives.
甚么是类星体和活跃星系核？
本文结果可用于类星体和星系核吸积盘。
The result of this paper may be applied to the accretion discs in quasars and AGN.
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