(An-Naba') 78 : 19
وَفُتِحَتِ السَّمَاءُ فَكَانَتْ أَبْوَابًا
And the sky will be opened; then it will be with different doors.
It is asked in verse 50: 6: haven’t they observed the sky above them—how We have constructed it and adorned it? It has no flaws. It is told in verses 82: 1 and 84: 1 that when that great event happens, the sky will be split asunder. See explanation 31: 10; 37: 6-7; and 67: 3-5.