Scientists say that before the galaxies in the universe were formed, celestial matter was initially in the form of gaseous matter.
In short, huge gaseous matter or clouds were present before the formation of the galaxies. To describe initial celestial matter, the word ‘smoke’ is more appropriate than gas. The following Qur’aanic verse refers to this state of the universe by the word dhukhan which means smoke.
“Moreover, He Comprehended In His design the sky, And it had been (as) smoke: He said to it And to the earth: ‘Come ye together, Willingly or unwillingly.’ They said: ‘We do come (Together), in willing obedience.’” [Al-Qur’aan 41:11]
Again, this fact is a corollary to the ‘Big Bang’ and was not known to the Arabs during the time of Prophet Muhammad (pbuh).
What then, could have been the source of this knowledge?