5 Theories Scientists Used to Believe That Are Completely Wrong

Explore five major scientific theories that were once widely accepted but later proven completely wrong in this educational video. Discover how Aristotle's mechanics dominated for nearly two millennia with ideas that objects needed constant pushing to move and heavy things fell faster, until Galileo and Newton revealed the true nature of motion and forces. Learn about the 18th-century caloric theory that treated heat as a flowing fluid, which seemed logical until experiments like cannon boring and Joule's paddle-wheel demonstrations proved heat was actually energy in motion, leading to modern thermodynamics. Examine the luminiferous aether concept that 19th-century physicists believed was necessary for light waves to travel through space, until the famous Michelson-Morley experiment and Einstein's special relativity eliminated the need for this medium entirely. Understand how even Newton's corpuscular theory of light, while explaining reflection and refraction, failed to account for diffraction and interference patterns that revealed light's wave nature, ultimately leading to quantum electrodynamics that unified both wave and particle properties. Investigate how Newton's law of universal gravitation, despite centuries of success, couldn't fully explain Mercury's orbital precession until Einstein's general relativity reimagined gravity as spacetime curvature. Gain insights into how science self-corrects through this pattern of theories being absorbed into deeper, more unifying frameworks, and learn to identify characteristics of robust scientific theories versus those destined to be replaced.