High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Timeline of gravitational physics and general relativity: 800s - Ja'far Muhammad ibn M?s? ibn Sh?kir hypothesizes that the heavenly bodies and celestial spheres are subject to the same laws of physics as Earth, unlike the ancients who believed that the celestial spheres followed their own set of physical laws different from that of Earth. In his Astral Motion and The Force of Attraction, he also proposes that there is a force of attraction between heavenly bodies, vaguely foreshadowing the law of gravity.

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