The Sureh begins with saying that there is no room for any doubt, that whatever of verses of Qurän has been inspired to you, are mere truth, and of surety from your Lord, but most of the fanciful people will not believe it! When man is left alone in freedom, and follows not a truthful leader, he will soon go astray, following his own caprices, and eventually will have the worst of fates.
The attentions are then attracted to the greatness and importance of the skies, and the planets that are supported on no visible pillars, which implies that there are invisible forces like the gravity that holds them on their orbits, in order to spin or move on.