Then He made seven heavens in two days (i.e. two phases) and endued every heavenly universe with its (built-in) system. And We adorned the lower heaven with lamps (i.e. stars and planets) and made it secure as well (so that the system of one may not interfere with the other). This is the system programmed by the Lord of Absolute Dominance (and Might), the All-Knowing (Lord).