What are the key takeaways from “Du canon à la Lune : la découverte de la gravité” on ScienceEtonnante?

What is this episode about?

Isaac Newton’s breakthrough was not the apocryphal falling apple, but a thought experiment involving a cannon. By visualizing how a projectile could orbit Earth if fired fast enough, he unified terrestrial ballistics with celestial mechanics, proving that the Moon is essentially a falling cannonball governed by the same inverse-square law of gravity.