Canonical · Physics & Entropy · Paper

Mass-Energy Equivalence

Albert Einstein · 1905

"Mass and energy are the same underlying quantity expressed in two forms — a small amount of mass corresponds to an enormous amount of energy, a relationship that later explained how stars generate light and how nuclear reactions release power."

The idea

In a three-page follow-up to special relativity, Einstein asked a small question — does a body's energy content affect its mass — and derived the most famous equation in physics: E=mc².

Why it works

The takeaway — recall it first

General Relativity

"Gravity isn't a force pulling objects together — it's the curvature of spacetime itself caused by mass and energy, and objects simply follow the straightest possible path through that curved geometry."

Albert Einstein · PaperContinue→