You can also read and listen to this episode on our blog: https://islamic-audio-book.com/15-the-force-of-gravity-and-orbital-movements/
The word "khunnas" in Surat at-Takwir 15 refers to shrinking and cowering, retracting and turning back. The word "jawaar" refers to one that moves and flows, and the word "khunnas" refers to the attraction of the planets towards their own centres and the Sun.
The Qur'an indicates that gravity, the force that attracts objects to the centre, already existed in the universe, but that it could only be revealed with mathematical formulae by Sir Isaac Newton.