The two physicists who each rewrote the laws of the universe. Who was greater?
English mathematician and physicist. In 1666 — while Cambridge was closed due to plague — he invented calculus, formulated the laws of motion, and derived the law of universal gravitation. His Principia Mathematica (1687) created classical mechanics and governed physics for 250 years. Also made foundational discoveries in optics and pioneered the scientific method as practiced today.
German-born theoretical physicist. His 1905 "miracle year" produced special relativity, mass-energy equivalence (E=mc²), the photoelectric effect, and Brownian motion — four papers, each worthy of a Nobel Prize. General relativity (1915) superseded Newton's gravitation with a geometric theory of spacetime that remains the most precisely tested theory in the history of science.
In 1999, the editors of Physics World surveyed the world's leading physicists: who is the greatest physicist of all time? Einstein came first. Newton came second. The margin was small. The debate has continued ever since — and for good reason. Both men achieved something that no other physicist has replicated: they each, singlehandedly, replaced the entire existing framework of physical understanding with one of their own construction.
Newton inherited a world in which no one understood why planets move, why objects fall, or why tides rise. He left a world governed by three laws of motion and one law of gravity — a mathematical system so precise it would put men on the moon 300 years later. The confidence this produced was so profound that Lord Kelvin, surveying physics in 1900, declared there was nothing left to discover except two "small clouds" on the horizon. Those clouds were quantum mechanics and relativity. Einstein produced both.
Einstein's special relativity (1905) revealed that Newton's absolute space and time were approximations — valid at low velocities but fundamentally wrong at high ones. General relativity (1915) replaced Newton's gravitational force — an instantaneous action at a distance that Newton himself found philosophically troubling — with curved spacetime, a geometric description so elegant and accurate that it predicts black holes, gravitational waves, and the expansion of the universe with precision that instruments are still catching up to measure. Einstein did not merely improve Newton. He revealed that Newtonian physics was a special case of something deeper.
Yet Newton's achievement may be the greater precisely because it came first. Newton had no predecessors worthy of the name in his domain. Kepler had described planetary orbits but could not explain them. Galileo had studied falling bodies but had no theory of gravity. Newton synthesized a cosmos from first principles, with no map and no guide. Einstein, brilliant as he was, stood on Newton's shoulders — using Newton's mathematical framework, Newton's gravitational constant, and Newton's concept of force as his starting points before transcending them. "If I have seen further," Newton wrote, "it is by standing on the shoulders of giants." Einstein's giant was Newton.
| Dimension | Isaac Newton | Albert Einstein |
|---|---|---|
| Greatest Work | Principia Mathematica (1687) — laws of motion + universal gravitation; created classical mechanics | General relativity (1915) — geometric theory of gravity; superseded Newton at extreme scales |
| Mathematics Created | Invented calculus (with Leibniz independently); binomial theorem; generalized series | Adapted Riemannian geometry for physics; did not invent new mathematics but used it profoundly |
| Predecessors | Essentially none in his core domains — built physics from near-scratch | Built on Newton, Maxwell, Lorentz, and Riemann — starting from an existing framework |
| Scope of Domains | Mechanics, gravity, optics, mathematics, alchemy, theology, economics (Mint) | Special and general relativity, quantum theory of light, statistical mechanics, cosmology, unified field theory |
| Theory Status | Classical mechanics — still used for everyday physics; superseded at relativistic speeds and extreme gravity | General relativity — most precisely tested theory in physics; not superseded in any domain yet |
| Nobel Prize | None — Nobel Prize didn't exist in his lifetime | Physics 1921 — for the photoelectric effect (not relativity, which was considered too speculative) |
Both Newton and Einstein did their most revolutionary work during extraordinary bursts of concentrated creativity. Newton's annus mirabilis was 1665–66, when Cambridge was shuttered by the plague and he retreated to his family farm in Woolsthorpe. In those two years, he invented the mathematics of calculus, derived the law of universal gravitation, and conducted the prism experiments that decomposed white light into its spectrum. He was twenty-three years old. The Principia he published twenty years later was largely the formalizing of insights he had reached in that plague year.
Einstein's miracle year was 1905 — when he was a 26-year-old patent clerk in Bern with no academic position, no laboratory, and no collaborators. He submitted four papers to Annalen der Physik in a single year. The first explained Brownian motion. The second introduced the photoelectric effect (the work that won him the Nobel Prize). The third introduced special relativity, abolishing absolute time and space. The fourth derived E=mc². Any one of these papers would have made a physicist's reputation. Together they transformed physics.
The parallel is striking and meaningful: both men did their best work young, in isolation, without institutional support, under conditions that removed ordinary distractions. What Newton and Einstein shared was not just intellect but a quality of focused, undistracted deep work that remains the rarest resource in science.
Most physics surveys place Einstein first and Newton second. Einstein's general relativity is more mathematically sophisticated, covers more phenomena, and has not been superseded — whereas Newton's classical mechanics was ultimately shown to be an approximation.
But the case for Newton is compelling: he worked from nothing, invented the mathematics he needed, and produced a system of such power that it governed physics for 250 years. The originality of Newton's position — building a cosmos with no map — may be the greatest intellectual feat in history.
The honest answer: Einstein edges ahead by modern consensus. Newton edges ahead by historical originality. Science is lucky to have had both.
Most physicists, when surveyed, rank Einstein and Newton as the two greatest physicists in history with Einstein slightly ahead. Newton's work was more original — he had fewer predecessors. Einstein's work was more mathematically sophisticated and covered more domains. The answer depends on whether you weight originality or scope.
Partially. General relativity superseded Newton's gravitation at extreme scales — near black holes, at relativistic speeds, or on cosmological distances. But for everyday physics — engineering, orbital mechanics, ballistics — Newtonian physics is still used because it is accurate enough and far simpler. Einstein didn't make Newton wrong; he revealed Newton's limits.
Einstein expressed deep admiration: "In one person, he combined the experimenter, the theorist, the mechanic and, not least, the artist in exposition. He stands before us strong, certain, and alone." Einstein saw himself as completing Newton's project, not overturning it.
Newton is commonly estimated at IQ 190–200; Einstein at 160–180. But IQ estimates for historical figures are extrapolations, not measurements — and IQ is a narrow measure of the kind of intelligence both men displayed. The comparison is more useful as a conversation about different kinds of genius than as a number.