What Is Gravity, Really? From Newton to Einstein

Drop an apple and it falls. But why? Nothing touches it, yet a whole planet pulls on it. Here are three answers to what gravity is — each better than the last — and the last one ends with physicists admitting "we don't know". Newton turned gravity into one simple rule and explained apples, tides and orbits — but even he hated not knowing how it works. Einstein's "happiest thought" turned gravity into curved space and time, predicted starlight bending around the Sun and fixed Mercury's orbit. You'll see why your feet age slower than your head, why your phone's GPS needs relativity every day, how LIGO caught ripples in spacetime from colliding black holes, and why gravity still refuses to fit with quantum physics. No physics background needed. ⏱ CHAPTERS 0:00 Why do things fall? 0:51 Newton: gravity as a force 2:03 Newton's problem: how does it pull? 2:56 Einstein: curved space and time 4:48 Gravity bends time (and your GPS) 6:09 Ripples in spacetime: LIGO 7:13 What we still don't know 8:24 So, what is gravity? 🔔 Subscribe to Nil Explains for clear, honest physics — no degree required. 💬 Tell us in the comments what we should explain next. #physics #gravity #einstein