Then when the stars lose their lights.meaning, their light will leave.This is similar to Allah's statement,وَإِذَا النُّجُومُ انكَدَرَتْAnd when the stars fall. (81:2)It is also similar to His statement,وَإِذَا الْكَوَاكِبُ انتَثَرَتْAnd when the stars have fallen and scattered. (82:2)Then Allah says,وَإِذَا السَّمَاء فُرِجَتْ