Dear aalim, islamic scholar, translator of the Quran – THE UNIVERSE WITH STARS ,PLANETS, THE MOON AND THE SUN IS THE “SAMAA AD DUNYA” AS MENTIONED IN THE QURAN..
PLEASE NOTE- THE UNIVERSE IS NOT THE FIRST HEAVEN as frequently heard in lectures by the ulema.
Quran 37-6
إِنَّا زَيَّنَّا ٱلسَّمَآءَ ٱلدُّنْيَا بِزِينَةٍ ٱلْكَوَاكِبِ ٦
Indeed, We have adorned the SAMAA AD DUNYA( lowest heaven) with the stars for decoration
Allah SWT knows best