And constructed above you seven strong [heavens] (78:12)

Almuntakhab Fi Tafsir Alquran Alkarim

We built above you seven fortitudinous heavens vast and with endless amplitude

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(78:12) and built above you seven strong firmaments, *9

And constructed above you seven strong [heavens] meaning

*9) "Strong" in the sense that their boundaries are so strongly fortified that no change whatever occurs in them, nor does any of the countless stars and planets in the heavens, violating these boundaries, collide with the other, nor falls down to the earth. (For further explanation, see E.N. 34 of Al-Baqarah, E.N. 2 of Ar Ra'd, E.N.'s 8, 12 of Al-Hijr, E.N. 15 of AI-Mu'minun, E.N. 13 of Luqman, E.N. 37 of Ya Sin, E.N.'s 5, 6 of As-Saaffat, E.N. 90 of Al-Mu'min, E.N.'s 7, 8 of Surah Qaf).
 

And constructed above you seven strong [heavens] meaning in Urdu

اور تمہارے اوپر سات مضبوط آسمان قائم کیے