The Insight
The Quran could have said planets move, travel, turn, rotate, or fly. It chose one specific verb: 'yasbahun' (يَسْبَحُون), they swim. Swimming is effortless, continuous motion through a medium with no propulsion required once begun and no resistance to overcome. This is precisely what orbital mechanics describes. A ball thrown in air decelerates, friction and gravity work against it. A rocket burns fuel constantly to stay aloft. A planet in orbit requires nothing, no engine, no ongoing force, just the sustained, frictionless, self-perpetuating motion of an object in gravitational equilibrium. That quality, effortless, continuous, requiring nothing to maintain, is exactly what the metaphor of swimming captures. Newton would not describe gravity and orbits mathematically for another thousand years. The Quran chose, from all verbs in Arabic, the one that most precisely captures the physical quality of what orbiting bodies do.