Table of Contents

What Is The History of Physics?

The history of physics is the story of how human beings gradually figured out the fundamental rules governing the universe — from the movements of planets to the behavior of subatomic particles. It’s a story that spans over 2,500 years, involves some of the most brilliant minds in history, and has reshaped civilization more profoundly than any political revolution.

The short version: ancient Greeks asked the questions. Medieval scholars preserved them. The Scientific Revolution answered some. And the 20th century demolished the comfortable answers and replaced them with something far stranger.

The Ancient Foundations

The Greeks were the first to attempt systematic explanations of the physical world without resorting to mythology. Thales of Miletus (c. 624-546 BC) proposed that all matter derived from water — wrong about the answer, right about the approach. Democritus (c. 460-370 BC) proposed that matter consisted of indivisible particles called atomos. He was remarkably close.

Aristotle (384-322 BC) dominated physics for nearly 2,000 years. His framework — based on observation but without experimentation — included the ideas that heavy objects fall faster than light ones, that the Earth is the center of the universe, and that objects in motion naturally come to rest. All wrong. But his systematic approach to categorizing natural phenomena was genuinely influential.

Archimedes (c. 287-212 BC) was the standout exception — a brilliant mathematician and experimentalist who discovered principles of buoyancy, levers, and hydrostatics that remain valid today.

The Scientific Revolution (1543-1687)

This is where physics as we know it began.

Copernicus (1543) proposed that the Earth orbits the Sun, not the other way around. He was right, but he published cautiously — his book came out as he was dying.

Galileo (1564-1642) established the experimental method. He dropped objects from towers (or rather, rolled them down inclines — the tower story is probably apocryphal), looked through telescopes, and systematically tested Aristotle’s claims. Most of them failed. Objects fall at the same rate regardless of weight. The Earth moves. Jupiter has moons. Galileo’s conflict with the Catholic Church became the defining science-vs-authority story of the era.

Kepler (1571-1630) discovered that planets orbit in ellipses, not circles — and his three laws of planetary motion provided the precise mathematical description that Newton would later explain.

Newton (1643-1727) unified everything. His Principia Mathematica (1687) presented the three laws of motion and the universal law of gravitation — explaining everything from falling apples to planetary orbits with a single mathematical framework. He also invented calculus (simultaneously with Leibniz) and made foundational contributions to optics.

Newton’s physics worked so well that it dominated for over 200 years. For two centuries, physics was essentially “figure out where Newton’s equations apply next.”

The 19th Century: Electricity, Magnetism, and Thermodynamics

Faraday and Maxwell unified electricity and magnetism into a single theory of electromagnetism. Maxwell’s equations (published in the 1860s) showed that light is an electromagnetic wave — one of the greatest theoretical insights in physics history.

Thermodynamics — developed by Carnot, Clausius, Kelvin, and Boltzmann — described how energy moves and transforms, establishing the concept of entropy and the laws of thermodynamics.

By 1900, many physicists believed their discipline was essentially complete. Lord Kelvin reportedly said only two small “clouds” remained over physics. Those clouds turned out to be the ultraviolet catastrophe and the Michelson-Morley experiment — and they blew the whole edifice apart.

The 20th Century: Everything Changes

Relativity

In 1905, Albert Einstein published four papers that changed physics forever. His special theory of relativity showed that space and time are intertwined, that nothing can travel faster than light, and that energy equals mass times the speed of light squared (E=mc²).

In 1915, his general theory of relativity replaced Newton’s gravity with a geometric description: massive objects curve the fabric of spacetime, and other objects follow that curvature. It was confirmed by the 1919 solar eclipse observation and has passed every test since.

Quantum Mechanics

Starting with Planck (1900), Bohr (1913), Heisenberg (1925), Schrödinger (1926), and Dirac (1928), physicists discovered that the subatomic world operates by profoundly counterintuitive rules. Particles behave as waves. Energy comes in discrete packets. Measurement affects the system being measured. Outcomes are fundamentally probabilistic.

Quantum mechanics and general relativity are the two pillars of modern physics. Both are confirmed to extraordinary precision. And they’re mathematically incompatible with each other — which is the central unsolved problem in physics today.

The Standard Model

By the 1970s, physicists had developed the Standard Model of particle physics — a quantum field theory that describes 17 fundamental particles and three of the four fundamental forces (electromagnetism, strong nuclear, weak nuclear). The Higgs boson, predicted in 1964, was confirmed in 2012 at CERN’s Large Hadron Collider.

The Standard Model is staggeringly successful. It’s also clearly incomplete — it doesn’t include gravity, doesn’t explain dark matter or dark energy, and has about 20 free parameters that must be measured experimentally rather than derived from theory.

Where We Stand

Physics in the 21st century faces profound questions: What is dark matter? What is dark energy? How do you reconcile quantum mechanics with gravity? Are there extra dimensions? Is the universe a multiverse?

The history of physics teaches a humbling lesson: every era’s “complete” understanding turned out to be incomplete. Newton’s perfect clockwork universe gave way to Einstein’s curved spacetime, which gave way to quantum uncertainty. Whatever comes next will likely be equally surprising — and equally beautiful.

Frequently Asked Questions

Who is considered the father of modern physics?

Galileo Galilei is often called the father of modern physics (and modern science). He pioneered the experimental method — systematically testing hypotheses through observation and measurement rather than relying on philosophical reasoning alone. His work on motion, gravity, and astronomy in the early 1600s established the foundation for Newton and all subsequent physics.

What are the biggest unsolved problems in physics?

Major open questions include: reconciling quantum mechanics with general relativity (quantum gravity), explaining dark matter and dark energy (which together make up 95% of the universe), understanding the matter-antimatter asymmetry, determining whether string theory or some other framework unifies the fundamental forces, and explaining the measurement problem in quantum mechanics.

When did physics become its own discipline?

Physics didn't separate from 'natural philosophy' until the 19th century. Newton called his masterwork 'Principia Mathematica Philosophiae Naturalis' (Mathematical Principles of Natural Philosophy). The term 'physicist' was coined in 1840 by William Whewell. The split from philosophy was gradual, driven by increasing mathematical formalism and experimental methodology.

Further Reading

• History of Physics - American Physical Society
• Physics History - American Institute of Physics
• Nobel Prize in Physics - History