History of Science Timeline

Carl Linnaeus's Systema Naturae organized living organisms into nested groups and popularized binomial nomenclature. His system provided a durable language for naming species, even though later evolutionary biology revised its underlying assumptions.

Image source: Carl Linnaeus

Benjamin Franklin's electrical experiments, including the famous kite experiment, supported the identification of lightning as electrical. He also introduced influential terminology and helped establish the distinction between positive and negative charge.

Image source: Benjamin Franklin

Antoine Lavoisier's Elements of Chemistry presented a new chemical nomenclature and emphasized precise measurement. His work explained combustion through oxygen and helped displace the phlogiston theory.

Image source: Antoine Lavoisier

Edward Jenner demonstrated that inoculation with cowpox material could protect against smallpox. The practice became the foundation of vaccination and ultimately contributed to the global eradication of smallpox.

Image source: Edward Jenner

John Dalton proposed that elements consist of distinct atoms and that compounds form through combinations in fixed ratios. His theory gave chemistry a powerful quantitative framework, later refined by discoveries about subatomic structure.

Image source: John Dalton

Michael Faraday showed that changing magnetic fields induce electric currents. Electromagnetic induction became the operating principle of generators, transformers, and much of modern electrical technology.

Image source: Michael Faraday

Charles Darwin presented evolution by natural selection as an explanation for the diversity and adaptation of life. The book transformed biology by connecting variation, inheritance, competition, and common descent.

Image source: On the Origin of Species

Louis Pasteur's experiments challenged spontaneous generation and linked microorganisms to fermentation and disease. His work supported germ theory, improved public health practices, and led to vaccines for several infections.

Image source: Louis Pasteur

James Clerk Maxwell's electromagnetic theory expressed electricity, magnetism, and light through a unified set of equations. It predicted electromagnetic waves and became a foundation of modern physics.

Image source: James Clerk Maxwell

Gregor Mendel reported experiments with pea plants showing that inherited traits are transmitted through discrete factors. Rediscovery of his work around 1900 helped establish genetics as a scientific discipline.

Image source: Gregor Mendel

Dmitri Mendeleev arranged known elements according to recurring chemical properties and atomic weights. He left gaps for undiscovered elements and successfully predicted several of their characteristics.

Image source: Dmitri Mendeleev

Wilhelm Röntgen discovered penetrating radiation that could create images of internal structures. X-rays rapidly transformed medical diagnosis and opened a new field of research into atomic and subatomic phenomena.

Image source: Wilhelm Röntgen

J. J. Thomson used cathode-ray experiments to demonstrate that atoms contain negatively charged particles smaller than atoms. The discovery of the electron challenged the idea that atoms were indivisible.

Image source: J. J. Thomson

Max Planck proposed that energy is emitted and absorbed in discrete packets to explain black-body radiation. This quantum hypothesis initiated the conceptual revolution that produced modern quantum physics.

Image source: Max Planck

Albert Einstein's special theory of relativity redefined space and time for objects moving at constant velocity and established the equivalence of mass and energy. It replaced Newtonian mechanics in the relativistic domain.

Image source: Special relativity

Alfred Wegener argued that continents had once formed a supercontinent and later moved apart. Although initially controversial because he lacked a mechanism, the idea became central to plate tectonics decades later.

Image source: Alfred Wegener

Albert Einstein's general theory of relativity described gravity as the curvature of spacetime produced by matter and energy. It predicted effects such as gravitational lensing and reshaped modern cosmology.

Image source: General relativity

Alexander Fleming observed that a mold inhibited bacterial growth and identified the substance as penicillin. Later development and mass production of the antibiotic inaugurated the antibiotic era.

Image source: Alexander Fleming

Edwin Hubble found a relationship between the distances of galaxies and their recession speeds. The observation provided strong evidence that the universe is expanding and became a foundation of modern cosmology.

Image source: Edwin Hubble

James Watson and Francis Crick proposed the double-helix structure of DNA, drawing on crucial evidence from Rosalind Franklin, Maurice Wilkins, and others. The model explained how genetic information could be copied and helped launch molecular biology.

Image source: Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid

The Human Genome Project produced a reference sequence covering most of the human genome and identified thousands of genes. Its completion accelerated genomic medicine, comparative biology, and large-scale biological data analysis.

Image source: Human Genome Project

Experiments at CERN's Large Hadron Collider announced evidence for the Higgs boson, the particle associated with the field that gives fundamental particles mass. The result completed a major prediction of the Standard Model of particle physics.

Image source: Higgs boson

Otto Hahn and Fritz Strassmann's experiments, interpreted by Lise Meitner and Otto Frisch, showed that uranium nuclei can split into smaller nuclei while releasing energy. The discovery transformed nuclear physics and energy technology.

Image source: Nuclear fission

Enrico Fermi's team achieved the first controlled, self-sustaining nuclear chain reaction beneath the University of Chicago. The experiment demonstrated the feasibility of nuclear reactors and supported the wartime Manhattan Project.

Image source: Chicago Pile-1

The Soviet Union launched Sputnik 1, the first artificial satellite. Its radio signals demonstrated the feasibility of orbital spaceflight and intensified international competition in science, engineering, and education.

Image source: Sputnik 1

Apollo 11 astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon while Michael Collins orbited above. The mission represented a major achievement in rocketry, navigation, computing, and space science.

Image source: Apollo 11

The Event Horizon Telescope collaboration released the first image of a black hole's shadow, observing the supermassive object at the center of galaxy M87. The result tested general relativity in an extreme gravitational environment.

Image source: Event Horizon Telescope