Surah Al Mursalat Tafseer

Then when the stars lose their lights.

meaning, their light will leave.

This is similar to Allah's statement,

وَإِذَا النُّجُومُ انكَدَرَتْ

And when the stars fall. (81:2)

It is also similar to His statement,

وَإِذَا الْكَوَاكِبُ انتَثَرَتْ

And when the stars have fallen and scattered. (82:2)

Then Allah says,

وَإِذَا السَّمَاء فُرِجَتْ