Verse 6

إِنَّ فِى ٱخْتِلَـٰفِ ٱلَّيْلِ وَٱلنَّهَارِ وَمَا خَلَقَ ٱللَّهُ فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ لَـَٔايَـٰتٍ لِّقَوْمٍ يَتَّقُونَ

Indeed in the variation of the night and the day and what God created in the vacua and matter, are Signs for people who fear god.