Surah Qaf 50:6

أَفَلَمْ يَنظُرُوٓا۟ إِلَى ٱلسَّمَآءِ فَوْقَهُمْ كَيْفَ بَنَيْنَـٰهَا وَزَيَّنَّـٰهَا وَمَا لَهَا مِن فُرُوجٍ

Have they not looked at the heaven above them - how We structured it and adorned it and [how] it has no rifts?

Translation: Saheeh International

Tafsir

Have they not then looked with their own eyes at the heaven being above them in order to take heed by their own minds of the consequences for them when they deny the Resurrection how We have built it without supports and adorned it with planets and how there are no cracks in it? no fissures blemishing it.

Excerpt from Tafsir al-Jalalayn, commentary on 50:6, via Quran.com. The reader has the full commentary and 9 more tafsirs.