Galaxies could cycle between an AGN phase and a starburst phase.When the cycles overlapped, astronomers would see both phenomena together.AGNs and starbursts may even evolve in unison.

• 星系有可能在AGN与恒星暴增这两个阶段之间交替循环，而当循环重叠时，天文学家将会看见两个现象共存，甚至有可能同步演化。