8. In the preceding( Ayats 14-15) it was stated that the disbelievers had become so hardened against the Quran that they would not have believed in it even if they had ascended the Heaven and seen with their own eyes the signs mentioned in it. Now in (Ayats 16-22), some of the signs are being cited in order to convince there of its truth.

Buruj (mansions of stars) are signs of Allah. For it is not possible to pass through one sphere of the Heaven into another, as each sphere of the space has been fortified by invisible boundaries. In this connection, it may be noted that literally the Arabic word burj means a fortified place, but as a technical term of ancient astronomy this stood for each of the twelve signs of the Zodiac, which marked the sun’s path through the heavens. This has led some of the commentators to form the opinion that in this verse the word buruj refers to the same. But there are some others who think that it means stars or planets. However, if we consider this word in the context of (Ayat 19), we are led to the conclusion that probably it stands for spheres.