Explained in Detail - 41:12
So He completed them in two days as seven heavens and revealed to each heaven its special laws. And We equipped the lowest heaven with lamps and a system of protection. This is the plan of the Supreme and All-Knowing.
The seven heavens and the universe were created in layers:
The Kingdom/67:3
He has created the seven heavens in layers. You will not find any flaw in the creation of the Most Merciful. Direct your gaze and see if you can see any crack in it.
Prophet Noah/71:15
Do you not see how Allah created the seven heavens in layers?
Explained in Detail/41:12
So He completed them in two days as seven heavens and revealed to each heaven its special laws. And We equipped the lowest heaven with lamps and a system of protection. This is the plan of the Supreme and All-Knowing.