question #1 Sahih Muslim 475, Book 4, Hadith 228 : What is the significance of reciting specific verses from the Qur’an during the dawn prayer?

I said the dawn prayer behind the Apostle of (ﷺ) and heard him reciting: ‘Nay. I call to witness the stars, running their courses and setting” (al-Qur’an, lxxxi. 15-16) and Done of us bent his back till he completed prostration.