Why does the Quran associate the earth and the heavens together, despite the great disparity in their sizes, and why was the earth created in four days while the heavens were created in two days?

The verses of the Holy Quran mention the Earth more than other parts of the universe, given its importance to humans as a dwelling and a source of enjoyment, and because it is a tangible environment for everyone, which calls for gratitude and thanksgiving to God. The Quran also frequently mentions the sun and the moon due to their direct benefits and their connection to acts of worship, despite the existence of larger celestial bodies. Scholars have pointed out the wisdom behind the shorter duration of the creation of the heavens compared to the Earth, as the Earth is the primary objective, with its benefits and trials. The Quran indicated that the creation of the Earth was first, followed by the creation of the heavens.