The Shoulders of Giants Trivia Quiz

In his book "On the Heavens (De Caelo)", Aristotle devised a geocentric planetary system, placing Earth at the center of the universe while the Sun, Moon, planets, and stars moved around it in perfect circular motions on celestial spheres. Aristotle's idea of a geocentric universe influenced astronomy for nearly two millennia.

Archimedes laid the foundation of statics, explaining how weights balance on a lever and demonstrating the mathematical principles behind centers of gravity in his "On the Equilibrium of Planes", written in the third century BCE. Archimedes was able to prove weights balance when distances from the fulcrum are inversely proportional.

His work on geometry, levers, buoyancy, and mathematical methods anticipated ideas that would not be fully developed again until the Scientific Revolution.

Like Aristotle centuries before him, Ptolemy's model of the universe placed a stationary Earth at its center. According to Ptolemy, planets travel in small circular paths called epicycles, which revolve around larger circular paths called deferents centered near or around Earth.

This framework Ptolemy devised was recorded in his major astronomical treatises, "Almagest" (originally titled "Mathematical Syntaxis") and "Planetary Hypotheses".

Copernicus challenged the ancient geocentric cosmos by proposing a heliocentric universe, with the Earth in motion around the Sun rather than fixed at the center of creation. He presented this in his book "On the Revolutions of the Heavenly Spheres", which he waited 30 years to publish (doing so in 1543 just before his death) in anticipation of how controversial his ideas would be. Copernicus originally proposed his heliocentric theory as a model for calculating planetary positions because of concerns of the church labeling him as a heretic if he proposed it as a description of reality.

In "Mystery of the Cosmos" (1596), Johannes Kepler defended Copernicus's heliocentric theory and argued that the spacing of the planets could be explained by the five Platonic solids nested between their orbits. Kepler was so obsessed with measurements and precision that he calculated his own gestational period to the minute--224 days, 9 hours, 53 minutes ("On the Shoulders of Giants: The Great Works of Physics and Astronomy." Running Press, 2002, p. 627).

Galileo published his book "Dialogue Concerning the Two Chief World Systems" in 1632. In it, he forcefully asserted the heliocentric model of the universe was not just a hypothesis, but the truth. This defied a 1616 Catholic edict against teaching this Copernican doctrine as factual, and in 1633, 90 years after the death of Copernicus, Galileo Galilei was taken to Rome to stand trial before the Inquisition for heresy.

Galileo's revolutionary scientific discoveries include his discovery of the isochronism of the pendulum (the period of swing being independent of the pendulum's amplitude) and sighting four moons around Jupiter, a discovery that had grave implications for those insisting on a geocentric model of the universe as factual.

"Philosophić Naturalis Principia Mathematica" (1687) is Isaac Newton's landmark work, presenting the laws of motion and the law of universal gravitation, showing that the same force governing falling objects on Earth also governs the Moon, planets, and comets.

It was in a 1676 letter to his bitter enemy Robert Hooke that Newton wrote his famous sentence, "If I have seen farther, it is by standing on the shoulders of giants." This statement is often used to describe Newton's acknowledgment of the scientific discoveries of Copernicus, Galileo, and Kepler before him, but in his letter to Hooke, Newton specifically referred to the study of the phenomena of thin plates to which Hooke and Descartes had made significant contributions.

James Clerk Maxwell published his paper "On Physical Lines and Force" in 1861, showing the initial links between electricity, magnetism, and light. He read his landmark paper, "A Dynamical Theory of the Electromagnetic Field", to the Royal Society in 1864.

In formulating the equations of electromagnetism, Maxwell showed how electricity, magnetism, and light are manifestations of the same force, basically achieving for energy what Newton had achieved for motion and gravity. His work transformed the understanding of energy and electromagnetism, laying crucial foundations for Albert Einstein's later development of relativity.

Albert Einstein presented the special theory of relativity "On the Electrodynamics of Moving Bodies" (1905), overturning long-held ideas about space and time by showing that the laws of physics are the same for all inertial observers and that the speed of light is constant. He revealed that measurements of length, time, and mass depend on an observer's state of motion.

Einstein proves genius isn't always recognized immediately. Although he would become one of the greatest theoretical physicists ever to have lived, the headmaster of the grade school he attended in Germany told his father, "He'll never make a success of anything" ("On the Shoulders of Giants", p. 1161).

By showing that distant galaxies are moving away from us, with more distant galaxies receding faster than nearer ones, Edwin Hubble observed and demonstrated that the universe is expanding. His observations transformed the view of the cosmos from a static universe to a dynamic one that has evolved over time.

In 1929, Hubble published evidence that more distant galaxies are moving away faster than nearer ones, a relationship now known as Hubble's Law, establishing the foundation for the modern Big Bang theory.