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Constant Acceleration
1589 Galileo Galilei uses balls rolling on inclined planes to show that different weights fall with the same constant acceleration -
Planetary Motion
1609 Johannes Kepler states his first two empirical laws of planetary motion -
First Telescope
1609 Galileo Galilei builds his first telescope -
Rotation of the Sun
1613 Galileo Galilei uses sunspots to demonstrate the rotation of the sun -
Force Law
1665 Isaac Newton deduces the inverse-square gravitational force law from the acceleration of the moon -
Lightning!
1752 Benjamin Franklin shows that lightning is electricity -
Heat as Energy
1798 Count Rumford has the idea that heat is a form of energy -
Electric Battery
1800 Alessandro Volta announces his invention of the electric battery -
Electromagnetic induction
1831 Faraday discovers electromagnetic induction -
Radio Waves
1888 Heinrich Hertz discovers radio waves -
Theory of Relativity
1915 Albert Einstein completes his theory of general relativity
