Surah Fussilat (Explained in Detail) 41 : 9

Explanatory Note

The general tone of the surah and the circumstances prevailing at the time admit this possibility creation of the Earth. Continuing to advocate the Divine message, the Prophet puts before them the enormity of the offence they commit by associating partners with God and rejecting His message. He points first to the universe, in relation to which they are tiny and flimsy creatures. He shows them God's power as reflected in the nature of this universe of which they constitute only a small part. He wants to draw them out of the narrow angle through which they look at the Divine message. From that angle, they see themselves as large, occupying important positions. Preoccupied with their own selves, positions and interests, and the fact that Muhammad was chosen by God in preference to them, they overlook the great truth expounded in the Qur'an and set before them by Muhammad. This great truth relates to the universe, to all generations of humanity, and carries absolutism that transcends time, place and people:
Say: Do you indeed disbelieve in Him who has created the earth in two days? And do you claim others to be His equals? It is He who is the Lord of all the worlds. He it is who placed on the earth firm mountains towering above it, and bestowed His blessings on it, and measured out its varied provisions in four days, ensuring equity for all who seek [such provisions]. Then, He applied His design to the sky, which was but smoke; and said to it and to the earth: 'Come, both of you, willingly or unwillingly' They both said: 'We do come willingly' So He decreed that they become seven heavens in two days, and assigned to each heaven its task. We adorned the sky nearest to the earth with lights, and made them secure. Such is the design of the Almighty, the All-Knowing.           (Verses 9-12)

When you declare disbelief, you are being nothing other than careless, gross and vulgar. You are denying the One who created the earth and placed firm structures over it, blessing it and assigning its varied provisions. He has indeed operated the systems of the universe, adorned the nearest sky with secure lights. Everything in the heavens and the earth willingly submit themselves to Him, while you, a mere single inhabitant on earth, arrogantly refuses to accept the truth.

The presentation of these facts in the surah typically shakes every heart: "Say: Do you indeed disbelieve in Him who has created the earth in two days? And do you claim others to be His equals? It is He who is the Lord of all the worlds. He it is who placed on the earth firm mountains towering above it, and bestowed His blessings on it, and measured out its varied provisions in four days, ensuring equi for all who seek [such provisions]." (Verses 9-10)

The surah begins here by mentioning the fact of creating the earth in two days and comments on this first stage of creation before telling us the rest of the story. The comment says: "It is He who is the Lord of all the worlds," and yet you claim others to be His equals when it is He who created the earth you live on. How absurd and ghastly!

Then, what are these days: the two in which God created the earth and the two in which He placed the mountains above it, measured its provisions and showered His blessings? These are days of God, the length of which is known to Him alone. They are not the earthly days we know, because earth days are a time-measuring unit that came into existence after the creation of the earth. Just like the earth has its day, which is the length of time it takes to complete one full rotation of the sun, other planets have their days, some of which are longer and some shorter than an earth day. This means that those four days of the earth's creation and its provisions are measured by some other unit unknown to us. The closest we can surmise given our limited knowledge, is that they refer to the different stages the earth went through, divided into several eras, until its crust solidified and it settled into its present shape able to support the type of life we know. According to scientific theory, such stages took around two billion earth years.