﴿ وَجَعَلْنَا ٱلسَّمَآءَ سَقْفًۭا مَّحْفُوظًۭا ۖ وَهُمْ عَنْ ءَايَٰتِهَا مُعْرِضُونَ ﴾

“and [that] We have set up the sky as a canopy well-secured? And yet, they stubbornly turn away from [all] the signs of this [creation],”

(And We have made the sky a roof) for the earth (withheld (from them)) such that it does not fall; it is also said that this means: it is protected from the satans by the stars. (Yet they) i.e. the people of Mecca (turn away from) they do not believe nor reflect upon (its portents) its sun, moon and stars.